{"id":"CVE-2026-8075","summary":"Posting a malicious markdown image crashes the Mattermost Desktop App","details":"Mattermost Desktop App versions \u003c=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","modified":"2026-08-16T03:48:37.476374783Z","published":"2026-07-17T10:05:06.211Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8075.json","unresolved_ranges":[{"extracted_events":[{"last_affected":"5.5.13"},{"last_affected":"6.0.2"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"Mattermost","cwe_ids":["CWE-754"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8075.json"},{"type":"ADVISORY","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8075"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/desktop","events":[{"introduced":"0"},{"fixed":"0da9b0cb34c4159e37f8e8a904d4c1ad7f8d993c"},{"fixed":"274602892a4391ac8c455cc09bdb52632ab282a9"},{"introduced":"30a408117be7b1f7adb21f0a70dd1610c2e6eaaa"},{"fixed":"9569d76bd8de2f8255fe80f0b9379dc429198c82"}],"database_specific":{"extracted_events":[{"introduced":"5.5.13"},{"fixed":"5.13.6"},{"introduced":"0"},{"fixed":"6.3"},{"introduced":"6.0.2"},{"fixed":"6.2.1"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*"}}],"versions":["v6.3.0-mas.1","v6.3.0-rc.3","v6.3.0-rc.2","v6.3.0-rc.1","v6.2.1-mas.1","v6.2.1-rc.1","v6.2.0-mas.1","v6.2.0","v5.13.6-rc.2","v5.13.6-rc.1","v6.2.0-rc.3","v5.13.5","v6.2.0-rc.2","v6.2.0-rc.1","v5.13.5-rc.1","v5.13.4","v5.13.4-rc.1","v5.13.3","v5.13.3-rc.1","v5.13.2-mas.1","v5.13.2","v5.13.2-rc.1","v5.13.1-mas.1","v5.13.1","v5.13.1-rc.2","v5.13.1-rc.1","v5.13.0-mas.1","v5.13.0","v5.13.0-rc.1","v4.7.0-beta2","beta2","4.7.0-beta","v1.3.0-rc2","v1.3.0","v1.3.0-rc1","v1.2.0","v1.1.1","v1.1.0","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v1.0.1","v1.0.0","v0.5.1","v0.5.0","v0.4.0","v0.3.0","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8075.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}