Bolt CMS Server-Side Template Injection via Unsandboxed allow_twig Field Rendering
CVSS score
8.8
EPSS probability
%0.5
Risk score
0.0
Published
2 mo ago
Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.
Impact on My Inventory
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%61
Short explanation
Bolt CMS core versions up to 6.1 suffer from server-side template injection due to unsanitized allow_twig field rendering. A user with standard editor access can execute arbitrary OS commands via a Twig payload. No official patch status is confirmed. CVSS score is 8.8 (High).
This vulnerability allows low-privilege users to execute arbitrary commands, leading to full system compromise. It is critical for organizations using Bolt CMS before version 6.2. No patch status is confirmed, increasing exposure risk.
What should be done?
- Upgrade to a version beyond 6.1 if a patch is released; otherwise, disable the allow_twig flag in content types or restrict access to the content field.
- Monitor for official vendor advisories for CVE-2026-71291.
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
Bolt CMS, içerik alanındaki allow_twig alanının temizlenmemiş olması nedeniyle sunucu tarafında şablon istismarı yapar. Bu, bir kullanıcı, düzenleyici rolüyle içerik kaydederken bir Twig yüklemesini kullanarak, web sunucusu kullanıcı adıyla uzak kod çalıştırmasını sağlar.
Açık, 6.1 sürümüne kadar olan Bolt CMS kütüphanesinde mevcut olup, Twig ortamı sanal alan olmadan render edilir ve varsayılan içerik türünün allow_twig bayrağı varsayılan olarak true olarak ayarlanır.
Açık, CVSS 3.1 puanı 8.8 (yüksek ciddiyet) ile değerlendirilir, resmî kaynaklarda yama durumu doğrulanamamıştır ve belirtilen bir düzeltme sürümü yoktur.
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-1336
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-71291 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | bolt | core | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 8.8 | CVSS V3_1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CVE CNA |
| 8.8 | CVSS V31 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-71291 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-71291 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
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Get this vulnerability through the API
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curl -H "x-api-key: $DAYBREACH_API_KEY" \ "https://api.enginteksut.com.tr/api/v1/intel/cves/CVE-2026-71291"