CVE-2026-64628

Summary

Grav contains a stored cross-site scripting vulnerability in shortcode-core attribute handlers where the XSS detection scan only matches payloads containing literal angle brackets, allowing shortcode parameters to bypass validation. Attackers with admin.pages permission can inject malicious JavaScript through shortcode attributes that execute in any viewer's browser, including administrators, enabling session hijacking via admin nonce theft.

Affected Software

Weaknesses

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

• https://github.com/getgrav/grav/security/advisories/GHSA-q5fw-vpqc-fgph
• https://www.vulncheck.com/advisories/grav-stored-cross-site-scripting-via-shortcode-attribute-handlers

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