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TI-2026-49958 Aliases CVE-2026-71291GHSA-m6xj-xx3f-5vv9

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

Priority MEDIUM 41CWE-1336Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-1336.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00549 46th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Boltcoreup to 6.1—No fix listedCNA
  • core VendorBolt Affected up to 6.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-71291
  2. 2026-10-03 Alias added: GHSA-m6xj-xx3f-5vv9

References

Advisory 2

  • TI-2022-16851 Bolt CMS contains a vulnerability in version 5.1.12 and below that allows an… CVSS 3.1HIGH 8.8
  • TI-2024-06761 Bolt CMS Showcase Creation showcases cross site scripting CVSS 4.0MEDIUM 5.3
  • TI-2024-06760 Bolt CMS Entry Preview page cross site scripting CVSS 4.0MEDIUM 5.3
  • TI-2026-09940 Bolt CMS HTML Attribute TextType.php HTML injection CVSS 4.0MEDIUM 5.1
  • TI-2025-24250 Bolt CMS Authenticated Remote Code Execution via Profile Injection and File Rename CVSS 4.0HIGH 7.5
  • TI-2021-17367 Bolt CMS <= 4.2 is vulnerable to Remote Code Execution. CVSS 3.1HIGH 8.8
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences