{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-8075", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-05-07T10:57:31.807Z", "datePublished": "2026-07-17T10:05:06.211Z", "dateUpdated": "2026-07-17T10:05:06.211Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "5.5.13", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.0.2", "status": "affected", "version": "0", "versionType": "semver"}, {"version": "6.3.0", "status": "unaffected"}, {"version": "5.13.6.0", "status": "unaffected"}, {"version": "6.2.1.0", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Jopraveen"}], "descriptions": [{"lang": "en", "value": "Mattermost Desktop App versions <=6.2 5.5.13 6.0.2.0 fail to properly null check when checking for headers in the Mattermost Desktop App which allows any user to crash another channel members Desktop App via posting a malicious link with an embedded image that misses one of those headers. Mattermost Advisory ID: MMSA-2026-00668"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseSeverity": "MEDIUM", "baseScore": 6.5}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-754: Improper Check for Unusual or Exceptional Conditions", "cweId": "CWE-754"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00668", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost Desktop App to versions 6.3.0, 5.13.6.0, 6.2.1.0 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00668", "defect": ["https://mattermost.atlassian.net/browse/MM-68689"], "discovery": "EXTERNAL"}, "title": "Posting a malicious markdown image crashes the Mattermost Desktop App", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-07-17T10:05:06.211Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.5.13]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.0.2]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "6.3.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "5.13.6.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "6.2.1.0"}}], "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": "2026-07-17T11:30:05.096984+00:00", "updated": "2026-07-17T11:30:05.097031+00:00", "vendors": ["mattermost", "mattermost$PRODUCT$mattermost"]}