{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-1629", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-01-29T15:19:16.856Z", "datePublished": "2026-03-16T20:24:05.415Z", "dateUpdated": "2026-03-17T13:36:52.223Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "10.11.10", "status": "affected", "version": "10.11.0", "versionType": "semver"}, {"version": "11.4.0", "status": "unaffected"}, {"version": "10.11.11", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Joshua Rogers"}], "descriptions": [{"lang": "en", "value": "Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel access which allows the user to continue viewing private channel content via previously cached permalink previews until cache reset or relogin.. Mattermost Advisory ID: MMSA-2026-00580"}], "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-672: Operation on a Resource after Expiration or Release", "cweId": "CWE-672"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00580", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost to versions 11.4.0, 10.11.11 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00580", "defect": ["https://mattermost.atlassian.net/browse/MM-67129"], "discovery": "EXTERNAL"}, "title": "Permalink Preview Information Disclosure After Permission Revocation", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-03-16T20:24:05.415Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-17T13:36:42.434578Z", "id": "CVE-2026-1629", "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": "2026-03-17T13:36:52.223Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-1629", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-17T13:36:42.434578Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-17T13:36:45.620Z"}}], "cna": {"title": "Permalink Preview Information Disclosure After Permission Revocation", "source": {"defect": ["https://mattermost.atlassian.net/browse/MM-67129"], "advisory": "MMSA-2026-00580", "discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Joshua Rogers"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Mattermost", "product": "Mattermost", "versions": [{"status": "affected", "version": "10.11.0", "versionType": "semver", "lessThanOrEqual": "10.11.10"}, {"status": "unaffected", "version": "11.4.0"}, {"status": "unaffected", "version": "10.11.11"}], "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Update Mattermost to versions 11.4.0, 10.11.11 or higher."}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00580", "tags": ["vendor-advisory"]}], "descriptions": [{"lang": "en", "value": "Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel access which allows the user to continue viewing private channel content via previously cached permalink previews until cache reset or relogin.. Mattermost Advisory ID: MMSA-2026-00580"}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-672", "description": "CWE-672: Operation on a Resource after Expiration or Release"}]}], "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-03-16T20:24:05.415Z"}}}, "cveMetadata": {"cveId": "CVE-2026-1629", "state": "PUBLISHED", "dateUpdated": "2026-03-17T13:36:52.223Z", "dateReserved": "2026-01-29T15:19:16.856Z", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "datePublished": "2026-03-16T20:24:05.415Z", "assignerShortName": "Mattermost"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "B6E5F368-358C-429B-8F04-3C8DF4A71A91", "versionEndExcluding": "10.11.11", "versionStartIncluding": "10.11.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel access which allows the user to continue viewing private channel content via previously cached permalink previews until cache reset or relogin.. Mattermost Advisory ID: MMSA-2026-00580"}], "id": "CVE-2026-1629", "lastModified": "2026-03-18T13:56:22.443", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}, "published": "2026-03-16T21:16:19.727", "references": [{"source": "responsibledisclosure@mattermost.com", "tags": ["Vendor Advisory"], "url": "https://mattermost.com/security-updates"}], "sourceIdentifier": "responsibledisclosure@mattermost.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-672"}], "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.11.0,10.11.10]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.4.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "10.11.11"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Mattermost", "source": "cna", "vendor": "Mattermost"}, "product": "mattermost", "vendor": "mattermost"}], "analysis": {"en": {"generated_at": "2026-03-18T16:05:29.596289+00:00", "value": {"mitigation_remediation": ["Update Mattermost to version 10.11.11, 11.4.0, or any later releases."], "summary": {"action": "Patch", "impact": "Information Disclosure of Private Channel Content"}, "threat_synthesis": {"affected_systems": "Mattermost Server is affected. The vulnerability exists in all 10.11.x releases through 10.11.10. Versions 10.11.11, 11.4.0, and all newer releases are not impacted.", "description_and_impact": "Mattermost server versions 10.11.x up to and including 10.11.10 fail to invalidate cached permalink preview data when a user loses channel access, which allows the user to view private channel content via previously cached previews until a cache reset or logout. The flaw results in unauthorized disclosure of private channel information and is classified as CWE-672.", "risk_and_exploitability": "The CVSS score of 4.3 indicates moderate severity, while the EPSS score of less than 1% shows a low likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog and there is no publicly documented exploit code. Attackers would need to have had prior access to the channel to obtain a permalink preview before the permission revocation."}}}}, "created": "2026-03-17T09:52:07.948554+00:00", "updated": "2026-03-24T10:49:47.338882+00:00", "vendors": ["mattermost", "mattermost$PRODUCT$mattermost"]}