CVE-2025-66311: Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/pages/[page]` in Multiples parameters

December 2, 2025

A Stored Cross-Site Scripting (XSS) vulnerability was identified in the /admin/pages/[page] endpoint of the Grav application. This vulnerability allows attackers to inject malicious scripts into the data[header][metadata], data[header][taxonomy][category], and data[header][taxonomy][tag] parameters. These scripts are stored in the page frontmatter and executed automatically whenever the affected page is accessed or rendered in the administrative interface.

References

github.com/advisories/GHSA-mpjj-4688-3fxg
github.com/getgrav/grav
github.com/getgrav/grav-plugin-admin/commit/99f653296504f1d6408510dd2f6f20a45a26f9b0
github.com/getgrav/grav/security/advisories/GHSA-mpjj-4688-3fxg
nvd.nist.gov/vuln/detail/CVE-2025-66311

Code Behaviors & Features

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