Grav vulnerable to Privilege Escalation and Authenticated Remote Code Execution via Twig Injection

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-66297
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-01 21:15:53 UTC
Updated2026-09-26 00:10:00 UTC
DescriptionGrav is a file-based Web platform. Prior to 1.8.0-beta.27, a user with admin panel access and permissions to create or edit pages in Grav CMS can enable Twig processing in the page frontmatter. By injecting malicious Twig expressions, the user can escalate their privileges to admin or execute arbitrary system commands via the scheduler API. This results in both Privilege Escalation (PE) and Remote Code Execution (RCE) vulnerabilities. This vulnerability is fixed in 1.8.0-beta.27.

Risk And Classification

Primary CVSS: v4.0 7.4 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:P/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: 0.007830000 probability, percentile 0.542490000 (date 2026-09-27)

Problem Types: CWE-1336 | CWE-1336 CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary7.4HIGHCVSS: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:P/C...
4.0CNADECLARED7.4HIGHCVSS: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:P
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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:P/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
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS: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)

TypeVendorProductVersionUpdateEditionLanguage
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

SourceVendorProductVersionPlatforms
CNA Getgrav Grav affected < 1.8.0-beta.27 Not specified

References

ReferenceSourceLinkTags
github.com/getgrav/grav/security/advisories/GHSA-858q-77wx-hhx6 [email protected] github.com Exploit, Third Party Advisory
github.com/getgrav/grav/commit/e37259527d9c1deb6200f8967197a9fa587c6458 [email protected] github.com Patch
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