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CVE-2021-29440

Twig allowing dangerous PHP functions by default

HIGH
7.2
CVSS Score
Published: April 13, 2021 at 07:55 PM UTC
Updated: June 17, 2026 at 03:47 AM UTC
1 product affected across 1 vendorGrav

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Severity
HIGH7.2
Exploit prediction
EPSS 30%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Grav· Getgravcomposer
95%
v < 1.7.11
Affected range stops below 1.7.11, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_MISCExploitThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://blog.sonarsource.com/grav-cms-code-execution-vulnerabilities
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc
x_refsource_MISCProductThird Party Advisory
Source: [email protected]
https://packagist.org/packages/getgrav/grav

CVSS

7.2HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-94

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