{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-93851",
        "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "state": "PUBLISHED",
        "assignerShortName": "Mattermost",
        "dateReserved": "2026-09-18T18:43:37.800Z",
        "datePublished": "2026-10-28T21:41:15.727Z",
        "dateUpdated": "2026-10-28T21:41:15.727Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "product": "Mattermost",
                    "vendor": "Mattermost",
                    "versions": [
                        {
                            "lessThanOrEqual": "11.9.1",
                            "status": "affected",
                            "version": "11.9.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "11.8.5",
                            "status": "affected",
                            "version": "11.8.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "11.7.10",
                            "status": "affected",
                            "version": "11.7.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "11.10.0",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.9.2",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.8.6",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.7.11",
                            "status": "unaffected"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "z01dberg"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10 fail to validate the target post ID in the Agents plugin's mention reminder component, which allows an authenticated user who can post in a channel visible to a system administrator to cause the administrator's browser to send an unintended API request, resulting in replacement of an installed plugin and code execution on the server, via a crafted post containing a forged mention reminder that the administrator clicks. Mattermost Advisory ID: MMSA-2026-00742"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "LOW",
                        "userInteraction": "REQUIRED",
                        "scope": "CHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "availabilityImpact": "HIGH",
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H",
                        "baseSeverity": "HIGH",
                        "baseScore": 8
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')",
                            "cweId": "CWE-22"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://mattermost.com/security-updates",
                    "name": "MMSA-2026-00742",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
            ],
            "solutions": [
                {
                    "value": "Update Mattermost to versions 11.10.0, 11.9.2, 11.8.6, 11.7.11 or higher.",
                    "lang": "en"
                }
            ],
            "source": {
                "advisory": "MMSA-2026-00742",
                "defect": [
                    "https://mattermost.atlassian.net/browse/MM-69957"
                ],
                "discovery": "EXTERNAL"
            },
            "title": "Path traversal in Mattermost Agents plugin mention reminder allows plugin replacement via crafted post",
            "providerMetadata": {
                "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
                "shortName": "Mattermost",
                "dateUpdated": "2026-10-28T21:41:15.727Z"
            },
            "x_generator": {
                "engine": "cvelib 1.8.0"
            }
        }
    }
}