Vulnerability-Lookup

CVE-2026-71291 (GCVE-0-2026-71291)

Vulnerability from cvelistv5 – Published: 2026-08-05 12:38 – Updated: 2026-08-05 15:47

Title

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

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 `self::getTwig()->createTemplate($value)->render(['record' => $this->getContent()])` with no sandboxing. Bolt's own bundled config/bolt/contenttypes.yaml sets `allow_twig: true` on the default "pages" contenttype's content field out of the box. Any user with edit access to that content type (a standard editor role, not just an administrator) can inject a Twig payload such as `{{ ['id']|map('passthru')|join }}` that executes arbitrary OS commands when the content is saved and rendered, achieving remote code execution as the web server user.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-1336

Assigner

TuranSec

References

2 references

URL	Tags
https://github.com/bolt/core
https://github.com/bolt/core/blob/6.1/src/Entity/…

Impacted products

1 product

Vendor	Product	Version
bolt	core	Affected: 0 , ≤ 6.1 (custom)

Credits

Saidakbarxon Maxsudxonov

Show details on NVD website

JSON

To clipboard

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GHSA-M6XJ-XX3F-5VV9

Vulnerability from github – Published: 2026-08-05 15:32 – Updated: 2026-08-05 15:32

Details

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 self::getTwig()->createTemplate($value)->render(['record' => $this->getContent()]) with no sandboxing. Bolt's own bundled config/bolt/contenttypes.yaml sets allow_twig: true on the default "pages" contenttype's content field out of the box. Any user with edit access to that content type (a standard editor role, not just an administrator) can inject a Twig payload such as {{ ['id']|map('passthru')|join }} that executes arbitrary OS commands when the content is saved and rendered, achieving remote code execution as the web server user.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-71291"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1336"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T13:24:53Z",
    "severity": "HIGH"
  },
  "details": "Bolt CMS renders content field values through Twig\u0027s 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\u0027s allow_twig flag and a regex checking for `{{`, `{%`, or `{#`; when true, the raw field value is compiled and rendered via `self::getTwig()-\u003ecreateTemplate($value)-\u003erender([\u0027record\u0027 =\u003e $this-\u003egetContent()])` with no sandboxing. Bolt\u0027s own bundled config/bolt/contenttypes.yaml sets `allow_twig: true` on the default \"pages\" contenttype\u0027s content field out of the box. Any user with edit access to that content type (a standard editor role, not just an administrator) can inject a Twig payload such as `{{ [\u0027id\u0027]|map(\u0027passthru\u0027)|join }}` that executes arbitrary OS commands when the content is saved and rendered, achieving remote code execution as the web server user.",
  "id": "GHSA-m6xj-xx3f-5vv9",
  "modified": "2026-08-05T15:32:21Z",
  "published": "2026-08-05T15:32:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71291"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bolt/core"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bolt/core/blob/6.1/src/Entity/Field.php"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-71291 (GCVE-0-2026-71291)

GHSA-M6XJ-XX3F-5VV9

Tags

Sightings

Nomenclature