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    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-22880",
        "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "state": "PUBLISHED",
        "assignerShortName": "Mattermost",
        "dateReserved": "2026-02-23T22:07:32.793Z",
        "datePublished": "2026-05-21T08:22:00.182Z",
        "dateUpdated": "2026-05-21T12:39:30.334Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "product": "Mattermost",
                    "vendor": "Mattermost",
                    "versions": [
                        {
                            "lessThanOrEqual": "2.0.37",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "11.0.4",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "11.1.3",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "11.3.2",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "10.11.11",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "version": "2.38.0",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.5.0",
                            "status": "unaffected"
                        },
                        {
                            "version": "2.37.1.0",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.4.1",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.3.2",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.2.4",
                            "status": "unaffected"
                        },
                        {
                            "version": "10.11.12",
                            "status": "unaffected"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Doyensec"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Mattermost Mobile Apps versions <=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via relaying the SSO code exchange flow through the mobile application. Mattermost Advisory ID: MMSA-2025-00564"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "NONE",
                        "userInteraction": "REQUIRED",
                        "scope": "CHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE",
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 6.1
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "description": "CWE-352: Cross-Site Request Forgery (CSRF)",
                            "cweId": "CWE-352"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://mattermost.com/security-updates",
                    "name": "MMSA-2025-00564",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
            ],
            "solutions": [
                {
                    "value": "Update Mattermost Mobile Apps to versions 2.38.0, 11.5.0, 2.37.1.0, 11.4.1, 11.3.2, 11.2.4, 10.11.12 or higher.",
                    "lang": "en"
                }
            ],
            "source": {
                "advisory": "MMSA-2025-00564",
                "defect": [
                    "https://mattermost.atlassian.net/browse/MM-66812"
                ],
                "discovery": "EXTERNAL"
            },
            "title": "Mobile SSO authentication flow allows credential theft via malicious server",
            "providerMetadata": {
                "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
                "shortName": "Mattermost",
                "dateUpdated": "2026-05-21T08:22:00.182Z"
            },
            "x_generator": {
                "engine": "cvelib 1.8.0"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-21T12:39:11.362984Z",
                                "id": "CVE-2026-22880",
                                "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": "2026-05-21T12:39:30.334Z"
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    }
}