CVE-2025-66294 - CVE House
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Status published High CVE-2025-66294

Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2025-66312
Grav Admin Plugin vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/accounts/groups/[group]` parameter `data[readableName]`
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CVE-2025-66311
Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/pages/[page]` in Multiples parameters
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CVE-2025-66310
Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/pages/[page]` parameter `data[header][template]` in Advanced Tab
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CVE-2025-66309
Grav vulnerable to Cross-Site Scripting (XSS) Reflected endpoint /admin/pages/[page], parameter data[header][content][items], located in the "Blog Config" tab
Medium 6.2
CVE-2025-66308
Grav Admin Plugin vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/config/site` parameter `data[taxonomies]`
Medium 6.8

Affected Vendor

Affected Software

grav
Vulnerable Versions:
< 1.8.0-beta.27

Timeline

Official Publish: December 1st, 2025
Last Modified: December 2nd, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-94 CWE-1336

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1505.003 Web Shell
Persistence
T1105 Ingress Tool Transfer
Command and Control
T1565.002 Stored Data Manipulation
Impact