{"id":"CVE-2026-77939","summary":"Flextype CMS 1.0.0-dev RCE via POST /api/v1/query Endpoint","details":"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 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.","modified":"2026-10-08T02:52:01.167896733Z","published":"2026-08-28T17:06:51.132Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-1336","CWE-94"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77939.json","unresolved_ranges":[{"extracted_events":[{"last_affected":"1.0.0-dev"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77939.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77939"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/flextype-cms-dev-rce-via-post-api-v1-query-endpoint"},{"type":"REPORT","url":"https://github.com/flextype/flextype/issues/595"},{"type":"PACKAGE","url":"https://github.com/flextype/flextype"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/flextype/flextype","events":[{"introduced":"0"},{"last_affected":"aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d"}]}],"versions":["v1.0.0-alpha.3","v1.0.0-alpha.2","v1.0.0-alpha.1","v0.9.16","v0.9.15","v0.9.14","v0.9.13","v0.9.12","v0.9.11","v0.9.10","v0.9.9","v0.9.8","v0.9.7","v0.9.6","v0.9.5","v0.9.4","v0.9.3","v0.9.2","v0.9.1","v0.9.0","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77939.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}