High severity · published Dec 1, 2025
CVE-2025-66294
Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass
8.8
CVSS
2.8%
EPSS
No
On KEV
Description
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a Server-Side Template Injection (SSTI) vulnerability exists in Grav that allows authenticated attackers with editor permissions to execute arbitrary commands on the server and, under certain conditions, may also be exploited by unauthenticated attackers. This vulnerability stems from weak regex validation in the cleanDangerousTwig method. This vulnerability is fixed in 1.8.0-beta.27.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.8% · higher than 86% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav · getgrav
< 1.8.0-beta.27 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66294
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66294
Patch
https://github.com/getgrav/grav/commit/e37259527d9c1deb6200f8967197a9fa587c6458
Exploit
https://github.com/getgrav/grav/security/advisories/GHSA-662m-56v4-3r8f
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