{"id":"CVE-2026-8683","aliases":["EUVD-2026-36732","GHSA-pf78-3frq-v82v"],"status":"published","title":"Overly long URLs crash the Mattermost Desktop App","description":"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","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00199,"percentile":0.0983,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-770"],"published":"2026-06-15T14:06:21Z","modified":"2026-10-28T02:30:35Z","products":[{"vendor":"mattermost","product":"mattermost"},{"vendor":"mattermost","product":"mattermost_desktop"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8683","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-pf78-3frq-v82v"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8683.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-8683","title":"Overly long URLs crash the Mattermost Desktop App","description":"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","status":"published","published":"2026-06-15T14:06:21.686Z","modified":"2026-06-15T16:06:03.652Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T13:48:02.226896Z"}],"euvd":[{"id":"EUVD-2026-36732","description":"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","status":"published","published":"2026-06-15T14:06:21Z","modified":"2026-06-15T16:06:03Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T18:20:41.888684Z"}],"ghsa":[{"id":"GHSA-pf78-3frq-v82v","title":"Mattermost Desktop App versions \u003c=6.1 5.5.13.0 fail to account for attempting to open extremely...","description":"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","status":"published","published":"2026-06-15T18:31:19Z","modified":"2026-06-15T18:31:25Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:08:46.336077Z"}],"nvd":[{"id":"CVE-2026-8683","description":"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","status":"published","published":"2026-06-15T16:16:34.7Z","modified":"2026-06-17T11:04:16.99Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:12:23.846948Z"}],"osv":[{"id":"CVE-2026-8683","title":"Overly long URLs crash the Mattermost Desktop App","description":"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","status":"published","published":"2026-06-15T14:06:21.686Z","modified":"2026-10-28T02:30:35.082490606Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:45:19.210277Z"}]}}