{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55867",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-17T16:44:40.996Z",
        "datePublished": "2026-08-28T22:14:35.743Z",
        "dateUpdated": "2026-08-28T22:14:35.743Z"
    },
    "containers": {
        "cna": {
            "title": "Graylog token revocation endpoint allows authenticated users to delete other users’ access tokens",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-639",
                            "lang": "en",
                            "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "LOW",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-j769-9gv9-65gr",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-j769-9gv9-65gr"
                },
                {
                    "name": "https://github.com/Graylog2/graylog2-server/pull/26049",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/pull/26049"
                },
                {
                    "name": "https://github.com/Graylog2/graylog2-server/pull/26051",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/pull/26051"
                },
                {
                    "name": "https://github.com/Graylog2/graylog2-server/pull/26053",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/pull/26053"
                },
                {
                    "name": "https://github.com/Graylog2/graylog2-server/pull/26055",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/pull/26055"
                },
                {
                    "name": "https://github.com/Graylog2/graylog2-server/commit/41d3745d0e52736d06c07d279ca0d72c1616df4c",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/commit/41d3745d0e52736d06c07d279ca0d72c1616df4c"
                },
                {
                    "name": "https://github.com/Graylog2/graylog2-server/commit/4f280138b53dc3bbb5749213e8cb1c8e372f23a2",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/commit/4f280138b53dc3bbb5749213e8cb1c8e372f23a2"
                },
                {
                    "name": "https://github.com/Graylog2/graylog2-server/commit/84b0ffa0bdf918f6edd2bb23a47254088634b1fc",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/commit/84b0ffa0bdf918f6edd2bb23a47254088634b1fc"
                },
                {
                    "name": "https://github.com/Graylog2/graylog2-server/commit/e5accc5f4ce48bd61b84bb8e5a13d21f8eac3da5",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Graylog2/graylog2-server/commit/e5accc5f4ce48bd61b84bb8e5a13d21f8eac3da5"
                }
            ],
            "affected": [
                {
                    "vendor": "Graylog2",
                    "product": "graylog2-server",
                    "versions": [
                        {
                            "version": ">= 6.2.0, < 6.3.12",
                            "status": "affected"
                        },
                        {
                            "version": ">= 7.0.0-alpha.1, < 7.0.7",
                            "status": "affected"
                        },
                        {
                            "version": ">= 7.1.0-alpha.1, < 7.1.2",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-28T22:14:35.743Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Graylog is a free and open log management platform. From 6.2.0 until 6.3.12, 7.0.7, and 7.1.2, the DELETE /users/{userId}/tokens/{idOrToken} endpoint implemented by UsersResource.revokeToken() in graylog2-server/src/main/java/org/graylog2/rest/resources/users/UsersResource.java checks USERS_TOKENREMOVE permission against the attacker-controlled userId path parameter before resolving the token selected by idOrToken. An authenticated user can provide an authorized userId while accessTokenService.loadById() or accessTokenService.load() resolves a token belonging to another user, including a service account or administrator, after which accessTokenService.destroy() deletes that token without checking AccessToken.getUserName(). The issue does not expose token contents, but unauthorized deletion causes integrity impact and can disrupt access-token-based integrations. This issue is fixed in versions 6.3.12, 7.0.7, and 7.1.2."
                }
            ],
            "source": {
                "advisory": "GHSA-j769-9gv9-65gr",
                "discovery": "UNKNOWN"
            }
        }
    }
}