CVE-2023-34251 — Grav is a flat-file content management system

Grav is a flat-file content management system. Versions prior to 1.7.42 are vulnerable to server side template injection. Remote code execution is possible by embedding malicious PHP code on the administrator screen by a user with page editing privileges. Version 1.7.42 contains

01What is this vulnerability?

Grav is a flat-file content management system. Versions prior to 1.7.42 are vulnerable to server side template injection. Remote code execution is possible by embedding malicious PHP code on the administrator screen by a user with page editing privileges. Version 1.7.42 contains a fix for this issue.

02Affected products

Vendor	Product	Versions
getgrav	grav	< 1.7.42

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-06-14T21:31:31.908Z
• Last modified: 2024-12-27T16:52:56.757Z

09References

• github.com — https://github.com/getgrav/grav/security/advisories/GHSA-f9jf-4cp4-4fq5
• github.com — https://github.com/getgrav/grav/commit/9d01140a63c77075ef09b26ef57cf186138151a5
• github.com — https://github.com/getgrav/grav/blob/develop/system/src/Grav/Common/Twig/Extensi…