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

high Affects getgrav/grav. Feed 2026.10.29.1, updated 2026-10-28; published 2025-12-02; advisory modified 2026-09-10.

Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass

Package: getgrav/grav Composer
Affected versions: <1.8.0-beta.27
Fixed in: 1.8.0-beta.27
Severity: high
Exploitation: not on CISA KEV · EPSS 3% (86.5th percentile)
Published: 2025-12-02
Source: osv.dev

References

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

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CVE-2022-2073 high Code injection in grav same package: getgrav/grav
CVE-2020-11529 medium Open Redirect in Grav same package: getgrav/grav
CVE-2024-28116 high Server-Side Template Injection (SSTI) with Grav CMS security sandbox bypass same package: getgrav/grav
CVE-2026-61450 medium Grav: Twig sandbox config exfiltration via grav.offsetGet + dump filter (CVE-2026-44738 by same package: getgrav/grav