XSS in Getgrav Grav
CVE-2026-75828
Grav before 2.0.15 contains a stored cross-site scripting vulnerability in the detectXss() function where unpaired quotes in unquoted attribute values bypass event-handler detection. Authenticated editors can inject event handlers like onerror= that pass validation and execute in visitor browsers when page content is rendered.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-vfmf-q6x9-cw96 (vendor-advisory)
- www.vulncheck.com/advisories/grav-before-stored-xss-via-detectxss-quote-bypass (third-party-advisory)
Frequently asked questions
- What is CVE-2026-75828?
- CVE-2026-75828 is a high-severity vulnerability in Getgrav Grav, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-08-18.
- How severe is CVE-2026-75828?
- High severity. CVSS v3 base score is 8.7 out of 10.