Getgrav Grav up to 2.0.18 Twig Sort Filter GravExtension.php spl_autoload code injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in Getgrav Grav up to 2.0.18. This affects the function spl_autoload of the file GravExtension.php of the component Twig Sort Filter. Performing a manipulation results in code injection. This vulnerability was named CVE-2026-85604. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in Getgrav Grav up to 2.0.18. This affects the function spl_autoload of the file GravExtension.php of the component Twig Sort Filter. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Grav before 2.0.19 (affected versions <= 2.0.17) contains a remote code execution vulnerability in the Twig sort filter. The sortFunc wrapper in GravExtension.php hardcodes Twig's isSandboxed argument to false, so unlike |map/|filter/|reduce, |sort accepts a plain function name inside the sandbox; the remaining denylist misses spl_autoload, which performs a PHP include. An authenticated user with only page-write rights (admin.pages or api.pages.write) can supply a crafted payload (e.g., via form frontmatter rendered by the Email plugin) that invokes spl_autoload through the sort filter, resulting in arbitrary PHP execution as the web server user.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-85604 since 09/04/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

By approaching the search of inurl:GravExtension.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.0.19 eliminates this vulnerability.

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Productinfo

Vendor

• Getgrav

Name

• Grav

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6
• 2.0.7
• 2.0.8
• 2.0.9
• 2.0.10
• 2.0.11
• 2.0.12
• 2.0.13
• 2.0.14
• 2.0.15
• 2.0.16
• 2.0.17
• 2.0.18

Website

• Product: https://github.com/getgrav/grav/

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