{"id":"CVE-2026-8683","summary":"Overly long URLs crash the Mattermost Desktop App","details":"Mattermost Desktop App versions \u003c=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652","modified":"2026-07-15T01:48:51.360615399Z","published":"2026-06-15T14:06:21.686Z","database_specific":{"cna_assigner":"Mattermost","cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8683.json","unresolved_ranges":[{"extracted_events":[{"last_affected":"5.5.13"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8683.json"},{"type":"ADVISORY","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8683"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/desktop","events":[{"introduced":"0"},{"last_affected":"f541b0cfdda853f51446582f7e1103c0f918a743"}],"database_specific":{"cpe":"cpe:2.3:a:mattermost:mattermost_desktop:*:-:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"5.13.0"}],"source":"CPE_RANGE"}}],"versions":["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-2026-8683.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}