XSS in Getgrav Grav
CVE-2026-42841
Grav is a file-based Web platform. Prior to 2.0.0-beta.2, an authenticated user with page editing permissions can inject an executable JavaScript event-handler attribute into rendered image HTML through Grav's Markdown media action syntax. The issue is caused by Markdown image query parameters being converted into callable media actions. The public attribute() media method can be reached this way, allowing an editor to set an arbitrary HTML attribute name and value on the generated image element. This vulnerability is fixed in 2.0.0-beta.2.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.003 · change: -0.002
Affected products
- Getgrav Grav — versions < 2.0.0-beta.2, 2.0.0
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-r7fx-8g49-7hhr (Exploit, Patch, Vendor Advisory)
- github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663 (Patch)
Frequently asked questions
- What is CVE-2026-42841?
- CVE-2026-42841 is a medium-severity vulnerability in Getgrav Grav, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-05-11.
- How severe is CVE-2026-42841?
- Medium severity. CVSS v3 base score is 4.8 out of 10.