Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass
Summary
| CVE | CVE-2025-66294 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-12-01 21:15:52 UTC |
| Updated | 2026-09-26 00:10:00 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 8.7 HIGH from [email protected]
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.028180000 probability, percentile 0.860140000 (date 2026-09-27)
Problem Types: CWE-94 | CWE-1336 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection') | CWE-1336 CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 8.7 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | DECLARED | 8.7 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Primary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
LowUser Interaction
NoneConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Getgrav | Grav | All | All | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta1 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta10 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta11 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta12 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta13 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta14 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta15 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta16 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta17 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta18 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta19 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta2 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta20 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta21 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta22 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta23 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta24 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta25 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta26 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta3 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta4 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta5 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta6 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta7 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta8 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta9 | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/getgrav/grav/commit/e37259527d9c1deb6200f8967197a9fa587c6458 | [email protected] | github.com | Patch |
| github.com/getgrav/grav/security/advisories/GHSA-662m-56v4-3r8f | [email protected] | github.com | Exploit, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.