Home/CVE/Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrat
CVE

CVE-2021-29440

Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrat

Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance.

The issue was addressed in version 1.7.11.

HIGH · CVSS 8.4 EPSS 0.11163
Act now
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 6% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-94Improper Control of Generation of Code ('Code Injection')
▤

Affected Products & Versions

1
getgrav grav< 1.7.11
⚠

Public Exploits & PoCs

3
webappsGrav CMS 1.7.10 - Server-Side Template Injection (SSTI) (Authenticated)2021-06-07
pocpacketstormsecurity.com · Grav-CMS-1.7.10-Server-Side-Template-Injection.htmlpacketstormsecurity.com
pocblog.sonarsource.com · grav-cms-code-execution-vulnerabilitiesblog.sonarsource.com
▣

Scoring & Timeline

8.4
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD13 Apr 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxcThird Party Advisory
https://packagist.org/packages/getgrav/gravProductThird Party Advisory
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