CVE-2026-49981: Auth Bypass

Description

Twig is a template language for PHP. Prior to 3.27.0, the per-template filter, tag, and function allow-list verdict is computed when a Template instance is constructed and can remain cached after sandbox state changes between renders, allowing a later sandboxed render to reuse a template that was originally checked with a different or empty policy. This issue is fixed in version 3.27.0.

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Weakness Type (CWE)

CWE-693 CWE-693

CWE-863 Incorrect Authorization

References

Other References

https://github.com/twigphp/Twig/commit/23eb6eb1267cb0d303b91eb5cff9b0c559c538a4 https://github.com/twigphp/Twig/releases/tag/v3.27.0 https://github.com/twigphp/Twig/security/advisories/GHSA-529h-vh3j-85hq

Frequently Asked Questions

What is CVE-2026-49981? +

Twig is a template language for PHP. Prior to 3.27.0, the per-template filter, tag, and function allow-list verdict is computed when a Template instance is constructed and can remain cached after sandbox state changes between renders, allowing a later sandboxed render to reuse a template that was originally checked with a different or empty policy. This issue is fixed in version 3.27.0.

How do I check if I'm vulnerable to CVE-2026-49981? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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