XSS in Getgrav Grav
CVE-2026-85598
Grav versions 2.0.0 through 2.0.17 fail to apply save-time XSS detection to modular pages, allowing authenticated page editors to store Twig-assembled XSS payloads. Attackers with page-edit rights can create modular pages with malicious Twig code that executes in visitor browsers when the parent page is rendered, including in administrator sessions.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-fg8g-663r-f366 (vendor-advisory)
- www.vulncheck.com/advisories/grav-2.0.0-through-2.0.17-stored-xss-via-modular-p… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85598?
- CVE-2026-85598 is a medium-severity vulnerability in Getgrav Grav, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-09-04.
- How severe is CVE-2026-85598?
- Medium severity. CVSS v3 base score is 6.4 out of 10.