CVE-2026-64628
Grav Stored Cross-Site Scripting via Shortcode Attribute Handlers
- State
- Published
- Severity
- 5.1 Medium
- Published
- Jul 21, 2026
- Updated
- Jul 23, 2026
- Reserved
- Jul 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
gravgetgrav |
|
References
- GitHub Security Advisory (GHSA-q5fw-vpqc-fgph)vendor-advisory
- VulnCheck Advisory: Grav Stored Cross-Site Scripting via Shortcode Attribute Handlersthird-party-advisory
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