Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Getgrav | Grav | <= 1.8.0 |
Related Weaknesses (CWE)
References
- https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663Patch
- https://github.com/getgrav/grav/security/advisories/GHSA-r7fx-8g49-7hhrVendor AdvisoryExploitPatch
- https://github.com/getgrav/grav/security/advisories/GHSA-r7fx-8g49-7hhrVendor AdvisoryExploitPatch
FAQ
What is CVE-2026-42841?
CVE-2026-42841 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 throu...
How severe is CVE-2026-42841?
CVE-2026-42841 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42841?
Check the references section above for vendor advisories and patch information. Affected products include: Getgrav Grav.