{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-2578", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-02-16T10:09:16.281Z", "datePublished": "2026-03-16T11:58:09.834Z", "dateUpdated": "2026-03-16T11:58:09.834Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "11.3.0", "status": "affected", "version": "11.3.0", "versionType": "semver"}, {"version": "11.4.0", "status": "unaffected"}, {"version": "11.3.1", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Joshua Rogers"}], "descriptions": [{"lang": "en", "value": "Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event.. Mattermost Advisory ID: MMSA-2026-00579"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseSeverity": "MEDIUM", "baseScore": 4.3}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-201: Insertion of Sensitive Information Into Sent Data", "cweId": "CWE-201"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00579", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost to versions 11.4.0, 11.3.1 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00579", "defect": ["https://mattermost.atlassian.net/browse/MM-67127"], "discovery": "EXTERNAL"}, "title": "Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-03-16T11:58:09.834Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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