CVE-2026-71291

Bolt CMS Server-Side Template Injection via Unsandboxed allow_twig Field Rendering

State: Published
Severity: 8.8 High
Published: Aug 5, 2026
Updated: Aug 10, 2026
Reserved: Aug 5, 2026

Description

Bolt CMS renders content field values through Twig's full application-level Environment with no SandboxExtension registered anywhere in the codebase. In src/Entity/Field.php, getTwigValue calls shouldBeRenderedAsTwig, which gates rendering only on the field definition's allow_twig flag and a regex checking for , , or ; when true, the raw field value is compiled and rendered via with no sandboxing.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	TuranSec

Weaknesses

CWE-1336

Affected Products

Product	Versions
corebolt	6.1 and earlierAffected

References

https://github.com/bolt/corethird-party-advisory
https://github.com/bolt/core/blob/6.1/src/Entity/Field.phpthird-party-advisory

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