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CVE-2026-71291— Bolt CMS Server-Side Template Injection via Unsandboxed allow_twig Field Rendering

Quick assessment

Affected
bolt core
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bolt是Bolt组织开源的一款内容管理系统。 Bolt 6.1及之前版本存在代码注入漏洞，该漏洞源于未注册SandboxExtension的情况下使用Twig全应用级Environment渲染内容字段值，仅通过allow_twig标志和正则检查过滤，导致具有编辑权限的用户可注入Twig有效载荷执行任意OS命令，实现远程代码执行。

CVSS 8.8 · High EPSS 0.55% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
bolt core ≤ 6.1 affected
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I. Basic Information for CVE-2026-71291

Vulnerability Information
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Vulnerability Title
Bolt CMS Server-Side Template Injection via Unsandboxed allow_twig Field Rendering
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
Bolt 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bolt是Bolt组织开源的一款内容管理系统。 Bolt 6.1及之前版本存在代码注入漏洞，该漏洞源于未注册SandboxExtension的情况下使用Twig全应用级Environment渲染内容字段值，仅通过allow_twig标志和正则检查过滤，导致具有编辑权限的用户可注入Twig有效载荷执行任意OS命令，实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bolt core 0 ~ 6.1 -

II. Public POCs for CVE-2026-71291

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9750 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-71291

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IV. Related Vulnerabilities

Same product: core
Same vendor: bolt
Same weakness: CWE-1336

V. Comments for CVE-2026-71291

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