{"id":"CVE-2026-75588","title":"Mattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insec…","summary":"Mattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insec…","severity":"low","cvss":2.6,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N","cwe":["CWE-1287"],"vendor":"Mattermost","product":"Mattermost","affected":["Mattermost <= 6.2.2"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T13:46:33.503","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-75588","references":[{"url":"https://mattermost.com/security-updates","label":"responsibledisclosure@mattermost.com"}],"tags":["nvd","cve.org"],"epss":0.00167,"epssPercentile":0.06336,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T19:21:58.878556Z"},"ingestedAt":"2026-09-17T16:21:47.709Z","slug":"CVE-2026-75588","body":"## Overview\n\nMattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insecure connection via a link using a downgraded URL scheme. Mattermost Advisory ID: MMSA-2026-00717\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":14,"depthScoreParts":{"impact":14.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}