# CVE-2025-66294: Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass

Source: https://junglewise.ai/threats/cve-2025-66294-grav-is-a-file-based-web-platform-prior-to-1-8-0-beta-27-a-server  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-01  
License: CC BY 4.0 with a link back

CVE-2025-66294 · Severity: high · CVSS 8.8 · Published 2025-12-01

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.

Technologies: [getgrav/grav (Packagist)](https://junglewise.ai/threats/technologies/getgrav-grav). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2025-66294 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-66294 being exploited in the wild.

**How severe is CVE-2025-66294?** High severity, with a CVSS score of 8.8, published 1 December 2025.

**Which products and versions are affected?** getgrav/grav (Packagist) ECOSYSTEM:introduced=0,fixed=1.8.0-beta.27.

**Is there a fix for CVE-2025-66294?** Yes. getgrav/grav (Packagist): upgrade to 1.8.0-beta.27 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-66294?** Check whether you run getgrav/grav (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- getgrav/grav (Packagist): upgrade to 1.8.0-beta.27 or later

  ```sh
  composer require getgrav/grav:^1.8.0-beta.27
  ```


## Affected products

- getgrav/grav (Packagist) ECOSYSTEM:introduced=0,fixed=1.8.0-beta.27

## Identifiers

- CVE-2025-66294
- GHSA-662m-56v4-3r8f

## Related threats

- [Grav cross-site scripting in Twig sandbox asset methods](https://junglewise.ai/threats/cve-2026-86197-grav-cross-site-scripting-in-twig-sandbox-asset-methods)
- [Grav Twig sandbox config exfiltration via offsetGet and dump filters](https://junglewise.ai/threats/cve-2026-61842-grav-twig-sandbox-config-exfiltration-via-offsetget-and-dump)
- [Grav ZipArchiver decompression bomb via missing extraction limits](https://junglewise.ai/threats/cve-2026-61690-grav-ziparchiver-decompression-bomb-via-missing-extraction-limits)
- [Grav incomplete Twig sandbox denylist information disclosure](https://junglewise.ai/threats/grav-incomplete-twig-sandbox-denylist-information-disclosure-e903bd3b)
- [Grav UserInterface offsetGet/offsetExists Twig sandbox bypass](https://junglewise.ai/threats/grav-userinterface-offsetget-offsetexists-twig-sandbox-bypass-f709468e)