{"id":"CVE-2026-100263","title":"In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible","summary":"In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","cwe":["CWE-79"],"vendor":"jetbrains","product":"youtrack","affected":["youtrack < 2026.2.18991"],"patched":["youtrack 2026.2.18991"],"published":"2026-09-30","updated":"2026-10-02","sourceUpdated":"2026-10-02T20:23:31.353","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100263","references":[{"url":"https://www.jetbrains.com/privacy-security/issues-fixed/","label":"cve@jetbrains.com"}],"tags":["nvd","cve.org"],"epss":0.00192,"epssPercentile":0.08812,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-30T15:35:06.223894Z"},"ingestedAt":"2026-09-30T16:10:07.681Z","slug":"CVE-2026-100263","body":"## Overview\n\nIn JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible\n\n## Affected\n\n- `youtrack < 2026.2.18991`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `youtrack 2026.2.18991`","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}