{"id":"CVE-2023-37897","summary":"Server-side Template Injection (SSTI) in grav","details":"Grav is a file-based Web-platform built in PHP. Grav is subject to a server side template injection (SSTI) vulnerability. The fix for another SSTI vulnerability using `|map`, `|filter` and `|reduce` twigs implemented in the commit `71bbed1` introduces bypass of the denylist due to incorrect return value from `isDangerousFunction()`, which allows to execute the payload prepending double backslash (`\\\\`). The `isDangerousFunction()` check in version 1.7.42 and onwards retuns `false` value instead of `true` when the `\\` symbol is found in the `$name`. This vulnerability can be exploited if the attacker has access to: 1. an Administrator account, or 2. a non-administrator, user account that has Admin panel access and Create/Update page permissions. A fix for this vulnerability has been introduced in commit `b4c6210` and is included in release version `1.7.42.2`. Users are advised to upgrade. There are no known workarounds for this vulnerability.\n\n","aliases":["GHSA-9436-3gmp-4f53"],"modified":"2026-07-08T07:16:20.390096113Z","published":"2023-07-18T20:22:13.008Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/37xxx/CVE-2023-37897.json","cwe_ids":["CWE-393","CWE-74"],"cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/37xxx/CVE-2023-37897.json"},{"type":"ADVISORY","url":"https://github.com/getgrav/grav/security/advisories/GHSA-9436-3gmp-4f53"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-37897"},{"type":"FIX","url":"https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b"},{"type":"FIX","url":"https://github.com/getgrav/grav/commit/b4c62101a43051fc7f5349c7d0a5b6085375c1d7"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/getgrav/grav","events":[{"introduced":"dc209453d0817547db0d3a8b27110decb63f2b5d"},{"fixed":"71bbed12f950de8335006d7f91112263d8504f1b"},{"fixed":"b4c62101a43051fc7f5349c7d0a5b6085375c1d7"}],"database_specific":{"extracted_events":[{"introduced":"1.7.42"},{"last_affected":"1.7.42"},{"introduced":"1.7.42.1"},{"last_affected":"1.7.42.1"}],"source":["CPE_STRING","REFERENCES"],"cpe":["cpe:2.3:a:getgrav:grav:1.7.42:*:*:*:*:*:*:*","cpe:2.3:a:getgrav:grav:1.7.42.1:*:*:*:*:*:*:*"]}}],"versions":["1.7.42","1.7.42.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-37897.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"}]}