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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

7.4 · 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 · score source

EPSS

• CVE-2025-66297: 0.84% estimated exploitation activity in the next 30 days; percentile 57.89 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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. Details Grav CMS allows Twig to be executed in page templates if enabled in admin panel (process: twig: true). A user with publisher/editor privileges, that can create or edit pages and enable twig processing, can thereby inject arbitrary code that will execute in the context of the page render. This enables exploitation of Grav internal APIs such as: - grav.user.update() and grav.user.save() for escalating the current user to super admin or admin - grav.scheduler.addCommand(), grav.scheduler.save() and grav.scheduler.run() for code execution The Twig sandbox is not enforced in this context, allowing…

Published by the source

2 Dec 2025, 01:24 UTC

Last modified by the source

2 Dec 2025, 01:24 UTC

Source last checked

26 Oct 2026, 14:35 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-858q-77wx-hhx6

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# Patch Next advisory brief: CVE-2025-66297

Advisory: Grav vulnerable to Privilege Escalation and Authenticated Remote Code Execution via Twig Injection
IDs: CVE-2025-66297, GHSA-858q-77wx-hhx6
Record: https://patchnext.com/advisories/cve-2025-66297 (revision 1, source checked 26 Oct 2026, 14:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: getgrav/grav 1.8.0-beta.27. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist getgrav/grav: affected < 1.8.0-beta.27; fixed in 1.8.0-beta.27

## Suggested inspection (read-only)
- Packagist getgrav/grav: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on getgrav/grav.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-858q-77wx-hhx6 (GitHub-reviewed advisory GHSA-858q-77wx-hhx6 lists affected ranges: Packagist getgrav/grav >=0 <1.8.0-beta.27)

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