CVE-2026-64628

Medium

Description

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.

SeverityMedium

CVSS5.4

Exploit probability—

Product

Grav

PublishedJul 21, 2026

First seenJul 21, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Vendor advisories

github.com/getgrav/grav/security/advisories/GHSA-q5fw-vpqc-fgph

Affected products

Product	Affected versions	Fixed in
getgrav grav	v ≤ 6.2.1	—

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