CVE-2026-64628

MEDIUM 5.4

Grav Stored Cross-Site Scripting via Shortcode Attribute Handlers

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	getgrav
Product	grav
Published	Jul 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

getgrav / grav

0 ≤ 6.2.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 YuvalMil 🔍 LeonKaya