{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-87119",
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "state": "PUBLISHED",
        "assignerShortName": "EEF",
        "dateReserved": "2026-09-11T18:00:02.032Z",
        "datePublished": "2026-09-22T11:16:56.232Z",
        "dateUpdated": "2026-09-22T12:02:31.484Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://repo.hex.pm",
                    "cpes": [
                        "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.MPP.Methods.Tempo.KeyAuthorization'",
                        "'Elixir.MPP.Methods.Tempo.Subscription'"
                    ],
                    "packageName": "mpp",
                    "packageURL": "pkg:hex/mpp",
                    "product": "mpp",
                    "programFiles": [
                        "lib/mpp/methods/tempo/key_authorization.ex",
                        "lib/mpp/methods/tempo/subscription.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.MPP.Methods.Tempo.KeyAuthorization':verify/3"
                        },
                        {
                            "name": "'Elixir.MPP.Methods.Tempo.KeyAuthorization':wallet_params/2"
                        },
                        {
                            "name": "'Elixir.MPP.Methods.Tempo.KeyAuthorization':from_rpc/1"
                        },
                        {
                            "name": "'Elixir.MPP.Methods.Tempo.Subscription':verify/2"
                        }
                    ],
                    "repo": "https://github.com/ZenHive/mpp",
                    "vendor": "ZenHive",
                    "versions": [
                        {
                            "lessThan": "0.16.2",
                            "status": "affected",
                            "version": "0.14.0",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "collectionURL": "https://github.com",
                    "cpes": [
                        "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.MPP.Methods.Tempo.KeyAuthorization'",
                        "'Elixir.MPP.Methods.Tempo.Subscription'"
                    ],
                    "packageName": "zenhive/mpp",
                    "packageURL": "pkg:github/zenhive/mpp",
                    "product": "mpp",
                    "programFiles": [
                        "lib/mpp/methods/tempo/key_authorization.ex",
                        "lib/mpp/methods/tempo/subscription.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.MPP.Methods.Tempo.KeyAuthorization':verify/3"
                        },
                        {
                            "name": "'Elixir.MPP.Methods.Tempo.KeyAuthorization':wallet_params/2"
                        },
                        {
                            "name": "'Elixir.MPP.Methods.Tempo.KeyAuthorization':from_rpc/1"
                        },
                        {
                            "name": "'Elixir.MPP.Methods.Tempo.Subscription':verify/2"
                        }
                    ],
                    "repo": "https://github.com/ZenHive/mpp",
                    "vendor": "ZenHive",
                    "versions": [
                        {
                            "lessThan": "4b6eaec02af0e8485cfb4ff68f467d075ed5dd6f",
                            "status": "affected",
                            "version": "db464dfa9a86ccda58f0827101f6da6bd8aafa78",
                            "versionType": "git"
                        }
                    ]
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>Only deployments offering Tempo subscriptions are affected, which requires <code>subscription_access_key_private_key</code> in the Tempo <code>method_config</code>. Exploitation further requires the attacker to have obtained a payer's signed activation credential, in transit over a hop that is not TLS-protected or at rest in a log, an intermediary, or a client retry buffer.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "Only deployments offering Tempo subscriptions are affected, which requires `subscription_access_key_private_key` in the Tempo `method_config`. Exploitation further requires the attacker to have obtained a payer's signed activation credential, in transit over a hop that is not TLS-protected or at rest in a log, an intermediary, or a client retry buffer."
                        }
                    ],
                    "value": "Only deployments offering Tempo subscriptions are affected, which requires subscription_access_key_private_key in the Tempo method_config. Exploitation further requires the attacker to have obtained a payer's signed activation credential, in transit over a hop that is not TLS-protected or at rest in a log, an intermediary, or a client retry buffer."
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "cpeMatch": [
                                {
                                    "criteria": "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*",
                                    "versionEndExcluding": "0.16.2",
                                    "versionStartIncluding": "0.14.0",
                                    "vulnerable": true
                                }
                            ],
                            "negate": false,
                            "operator": "OR"
                        }
                    ],
                    "operator": "AND"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "E.FU"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "E.FU"
                },
                {
                    "lang": "en",
                    "type": "coordinator",
                    "value": "Jonatan Männchen / EEF"
                }
            ],
            "dateAssigned": "2026-09-15T15:20:31.000Z",
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>Authentication Bypass by Capture-replay in ZenHive mpp allows an attacker holding a captured subscription activation credential to charge the payer repeatedly.</p>\n<p>The payer signs a Tempo <code>KeyAuthorization</code> over the chain id, key type, key id, expiry, limits and scopes only, with nothing tying it to the challenge that prompted it. <code>MPP.Methods.Tempo.KeyAuthorization.verify/3</code> in <code>lib/mpp/methods/tempo/key_authorization.ex</code> pins each of those signed fields against the subscription request, and the access key it pins is a static per-endpoint server key, so one signed authorization verifies against every challenge the server issues for the same subscription terms. <code>MPP.Methods.Tempo.Subscription.activate/4</code> deduplicates activations by challenge id, so presenting the captured credential under a fresh challenge produces a different dedup key, <code>claim_activation</code> succeeds, and the subscription transaction is built and broadcast again. Each replay charges the payer's wallet a new first-period settlement and re-authorizes the server key, bounded only by the subscription expiry and the chain's own semantics for re-installing an existing key.</p>\n<p>This issue affects mpp: from 0.14.0 before 0.16.2.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "Authentication Bypass by Capture-replay in ZenHive mpp allows an attacker holding a captured subscription activation credential to charge the payer repeatedly.\n\nThe payer signs a Tempo `KeyAuthorization` over the chain id, key type, key id, expiry, limits and scopes only, with nothing tying it to the challenge that prompted it. `MPP.Methods.Tempo.KeyAuthorization.verify/3` in `lib/mpp/methods/tempo/key_authorization.ex` pins each of those signed fields against the subscription request, and the access key it pins is a static per-endpoint server key, so one signed authorization verifies against every challenge the server issues for the same subscription terms. `MPP.Methods.Tempo.Subscription.activate/4` deduplicates activations by challenge id, so presenting the captured credential under a fresh challenge produces a different dedup key, `claim_activation` succeeds, and the subscription transaction is built and broadcast again. Each replay charges the payer's wallet a new first-period settlement and re-authorizes the server key, bounded only by the subscription expiry and the chain's own semantics for re-installing an existing key.\n\nThis issue affects mpp: from 0.14.0 before 0.16.2."
                        }
                    ],
                    "value": "Authentication Bypass by Capture-replay in ZenHive mpp allows an attacker holding a captured subscription activation credential to charge the payer repeatedly.\n\nThe payer signs a Tempo KeyAuthorization over the chain id, key type, key id, expiry, limits and scopes only, with nothing tying it to the challenge that prompted it. MPP.Methods.Tempo.KeyAuthorization.verify/3 in lib/mpp/methods/tempo/key_authorization.ex pins each of those signed fields against the subscription request, and the access key it pins is a static per-endpoint server key, so one signed authorization verifies against every challenge the server issues for the same subscription terms. MPP.Methods.Tempo.Subscription.activate/4 deduplicates activations by challenge id, so presenting the captured credential under a fresh challenge produces a different dedup key, claim_activation succeeds, and the subscription transaction is built and broadcast again. Each replay charges the payer's wallet a new first-period settlement and re-authorizes the server key, bounded only by the subscription expiry and the chain's own semantics for re-installing an existing key.\n\nThis issue affects mpp: from 0.14.0 before 0.16.2."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-60",
                    "descriptions": [
                        {
                            "lang": "en",
                            "supportingMedia": [
                                {
                                    "base64": false,
                                    "type": "text/html",
                                    "value": "<p>An attacker who obtains a payer's subscription activation credential (from a non-TLS hop, a log, a compromised intermediary, or the client's own retry buffer) can present it under fresh challenges to settle repeated first-period charges against that payer's wallet and re-authorize the server's access key. The payer bears the on-chain cost, limited only by the per-period subscription limit and the subscription expiry.</p>"
                                },
                                {
                                    "base64": false,
                                    "type": "text/markdown",
                                    "value": "An attacker who obtains a payer's subscription activation credential (from a non-TLS hop, a log, a compromised intermediary, or the client's own retry buffer) can present it under fresh challenges to settle repeated first-period charges against that payer's wallet and re-authorize the server's access key. The payer bears the on-chain cost, limited only by the per-period subscription limit and the subscription expiry."
                                }
                            ],
                            "value": "An attacker who obtains a payer's subscription activation credential (from a non-TLS hop, a log, a compromised intermediary, or the client's own retry buffer) can present it under fresh challenges to settle repeated first-period charges against that payer's wallet and re-authorize the server's access key. The payer bears the on-chain cost, limited only by the per-period subscription limit and the subscription expiry."
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "HIGH",
                        "attackRequirements": "PRESENT",
                        "attackVector": "NETWORK",
                        "baseScore": 8.2,
                        "baseSeverity": "HIGH",
                        "privilegesRequired": "NONE",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-294",
                            "description": "CWE-294 Authentication Bypass by Capture-replay",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
                "shortName": "EEF",
                "dateUpdated": "2026-09-22T11:16:56.232Z"
            },
            "references": [
                {
                    "name": "GitHub Advisory",
                    "tags": [
                        "related",
                        "vendor-advisory"
                    ],
                    "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-p9fv-9w58-95x2"
                },
                {
                    "name": "EEF CNA record for CVE-2026-87119",
                    "tags": [
                        "related"
                    ],
                    "url": "https://cna.erlef.org/cves/CVE-2026-87119.html"
                },
                {
                    "name": "OSV record EEF-CVE-2026-87119",
                    "tags": [
                        "related"
                    ],
                    "url": "https://osv.dev/vulnerability/EEF-CVE-2026-87119"
                },
                {
                    "name": "Introducing commit db464df in ZenHive/mpp",
                    "tags": [
                        "related"
                    ],
                    "url": "https://github.com/ZenHive/mpp/commit/db464dfa9a86ccda58f0827101f6da6bd8aafa78"
                },
                {
                    "name": "Fix commit 4b6eaec in ZenHive/mpp",
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/ZenHive/mpp/commit/4b6eaec02af0e8485cfb4ff68f467d075ed5dd6f"
                }
            ],
            "source": {
                "discovery": "INTERNAL"
            },
            "title": "mpp Tempo subscription key authorization is not bound to the issuing challenge, allowing a captured activation credential to be replayed"
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-22T12:02:12.184296Z",
                                "id": "CVE-2026-87119",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-22T12:02:31.484Z"
                }
            }
        ]
    }
}