CVE-2026-85604

Summary

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.

Affected Software

Weaknesses

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

References

• https://github.com/getgrav/grav/security/advisories/GHSA-p6qj-p5m7-f62h
• https://www.vulncheck.com/advisories/grav-before-2.0.19-remote-code-execution-via-sort-filter

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