Vulnerability Description
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, Grav CMS is vulnerable to a Server-Side Template Injection (SSTI) that allows any authenticated user with editor permissions to execute arbitrary code on the remote server, bypassing the existing security sandbox. Since the security sandbox does not fully protect the Twig object, it is possible to interact with it (e.g., call methods, read/write attributes) through maliciously crafted Twig template directives injected into a web page. This allows an authenticated editor to add arbitrary functions to the Twig attribute system.twig.safe_filters, effectively bypassing the Grav CMS sandbox. This vulnerability is fixed in 1.8.0-beta.27.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Getgrav | Grav | < 1.8.0 |
Related Weaknesses (CWE)
References
- https://github.com/getgrav/grav/commit/e37259527d9c1deb6200f8967197a9fa587c6458Patch
- https://github.com/getgrav/grav/security/advisories/GHSA-gjc5-8cfh-653xExploitThird Party Advisory
FAQ
What is CVE-2025-66299?
CVE-2025-66299 is a vulnerability with a CVSS score of 8.8 (HIGH). Grav is a file-based Web platform. Prior to 1.8.0-beta.27, Grav CMS is vulnerable to a Server-Side Template Injection (SSTI) that allows any authenticated user with editor permissions to execute arbit...
How severe is CVE-2025-66299?
CVE-2025-66299 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-66299?
Check the references section above for vendor advisories and patch information. Affected products include: Getgrav Grav.