{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86348", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-09-07T09:35:28.446Z", "datePublished": "2026-09-14T13:52:24.602Z", "dateUpdated": "2026-09-14T19:23:01.298Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "<=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0", "status": "affected", "version": "<=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0", "versionType": "semver"}, {"version": "11.10.0", "status": "unaffected"}, {"version": "11.9.1", "status": "unaffected"}, {"version": "11.8.5", "status": "unaffected"}, {"version": "11.7.8", "status": "unaffected"}, {"version": "10.11.23", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "alimursaliyev"}], "descriptions": [{"lang": "en", "value": "Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "baseSeverity": "MEDIUM", "baseScore": 4.3}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-704: Incorrect Type Conversion or Cast", "cweId": "CWE-704"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00701", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost to versions 11.10.0, 11.9.1, 11.8.5, 11.7.8, 10.11.23 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00701", "defect": ["https://mattermost.atlassian.net/browse/MM-69361"], "discovery": "EXTERNAL"}, "title": "MS Calendar plugin: unrecovered handler panics from malformed post-action requests could crash the plugin process", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-09-14T13:52:24.602Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-86348", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-14T19:13:36.957049Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-14T19:23:01.298Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86348", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-09-07T09:35:28.446Z", "datePublished": "2026-09-14T13:52:24.602Z", "dateUpdated": "2026-09-14T19:23:01.298Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "<=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0", "status": "affected", "version": "<=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0", "versionType": "semver"}, {"version": "11.10.0", "status": "unaffected"}, {"version": "11.9.1", "status": "unaffected"}, {"version": "11.8.5", "status": "unaffected"}, {"version": "11.7.8", "status": "unaffected"}, {"version": "10.11.23", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "alimursaliyev"}], "descriptions": [{"lang": "en", "value": "Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "baseSeverity": "MEDIUM", "baseScore": 4.3}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-704: Incorrect Type Conversion or Cast", "cweId": "CWE-704"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00701", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost to versions 11.10.0, 11.9.1, 11.8.5, 11.7.8, 10.11.23 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00701", "defect": ["https://mattermost.atlassian.net/browse/MM-69361"], "discovery": "EXTERNAL"}, "title": "MS Calendar plugin: unrecovered handler panics from malformed post-action requests could crash the plugin process", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-09-14T13:52:24.602Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-86348", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-14T19:13:36.957049Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-14T19:15:28.648Z"}}]}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "<=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0", "status": "affected", "version": "<=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0", "versionType": "semver"}, {"status": "unaffected", "version": "11.10.0"}, {"status": "unaffected", "version": "11.9.1"}, {"status": "unaffected", "version": "11.8.5"}, {"status": "unaffected", "version": "11.7.8"}, {"status": "unaffected", "version": "10.11.23"}]}], "source": "[email protected]"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "0125A38B-0B1B-47BA-B304-7038A717569D", "versionEndExcluding": "10.11.23", "versionStartIncluding": "10.11.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "D2DA84D0-1DE9-4846-88A0-377A6AE7FF7F", "versionEndExcluding": "11.7.8", "versionStartIncluding": "11.7.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "28B7B007-C6AE-43A8-8E34-67A52789DC27", "versionEndExcluding": "11.8.5", "versionStartIncluding": "11.8.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "AAA4200F-4BD8-4E69-A405-81E98F6208D5", "versionEndExcluding": "11.9.1", "versionStartIncluding": "11.9.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701"}], "id": "CVE-2026-86348", "lastModified": "2026-10-14T19:28:53.743", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-86348", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-14T19:13:36.957049Z", "version": "2.0.3"}}]}, "published": "2026-09-14T14:17:15.570", "references": [{"source": "[email protected]", "tags": ["Vendor Advisory"], "url": "https://mattermost.com/security-updates"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-704"}], "source": "[email protected]", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "<=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.10.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.9.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.8.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.7.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "10.11.23"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Mattermost", "source": "cna", "vendor": "Mattermost"}, "product": "mattermost", "vendor": "mattermost"}], "created": "2026-09-14T16:15:03.600107+00:00", "updated": "2026-09-15T14:30:08.101822+00:00", "vendors": ["mattermost", "mattermost$PRODUCT$mattermost"]}