{"id":"CVE-2026-77939","title":"Flextype CMS through v1.0.0-dev contains an expression language injection vulnerability that allows authenticated attackers with a valid API token to read arbitrary files by passing unsanitized user-supplied input to the Symfony Expressi…","summary":"Flextype CMS through v1.0.0-dev contains an expression language injection vulnerability that allows authenticated attackers with a valid API token to read arbitrary files by passing unsanitized user-supplied input to the Symfony Expressi…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-94","CWE-1336"],"published":"2026-08-28","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:23:49.880","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77939","references":[{"url":"https://github.com/flextype/flextype/issues/595","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/flextype-cms-dev-rce-via-post-api-v1-query-endpoint","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00444,"epssPercentile":0.38023,"ingestedAt":"2026-09-08T21:11:12.287Z","slug":"CVE-2026-77939","body":"## Overview\n\nFlextype CMS through v1.0.0-dev contains an expression language injection vulnerability that allows authenticated attackers with a valid API token to read arbitrary files by passing unsanitized user-supplied input to the Symfony ExpressionLanguage engine via the POST /api/v1/query endpoint. Attackers can leverage exposed application objects including filesystem() and serializers() within the evaluation scope to read arbitrary server files and achieve conditional remote code execution if a PHP file can be placed on disk through a secondary vector.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}