{"id":"CVE-2026-77139","title":"The extension fails to validate a client-supplied template element key before using it to build file paths for saving and deleting Mask template files","summary":"The extension fails to validate a client-supplied template element key before using it to build file paths for saving and deleting Mask template files. An authenticated backend user with access to the Mask module can supply a key contain…","severity":"none","cwe":["CWE-22","CWE-73"],"published":"2026-08-25","updated":"2026-09-28","sourceUpdated":"2026-09-28T23:10:00.143","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77139","references":[{"url":"https://typo3.org/security/advisory/typo3-ext-sa-2026-017","label":"f4fb688c-4412-4426-b4b8-421ecf27b14a"}],"tags":["nvd"],"ingestedAt":"2026-09-28T23:23:00.542Z","slug":"CVE-2026-77139","body":"## Overview\n\nThe extension fails to validate a client-supplied template element key before using it to build file paths for saving and deleting Mask template files. An authenticated backend user with access to the Mask module can supply a key containing path traversal sequences to create or delete .html files outside the configured template directory.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}