CVE-2025-66310: Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/pages/[page]` parameter `data[header][template]` in Advanced Tab

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][template] parameter. The script is saved within the page’s frontmatter and executed automatically whenever the affected content is rendered in the administrative interface or frontend view.

References

github.com/advisories/GHSA-7g78-5g5g-mvfj
github.com/getgrav/grav
github.com/getgrav/grav-plugin-admin/commit/99f653296504f1d6408510dd2f6f20a45a26f9b0
github.com/getgrav/grav/security/advisories/GHSA-7g78-5g5g-mvfj
nvd.nist.gov/vuln/detail/CVE-2025-66310

Code Behaviors & Features

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