Vulnerability Description
Grav is a file-based Web platform. Prior to 2.0.0-rc.9, Grav's incomplete fix for stored XSS through the Markdown media attribute action (CVE-2026-42841) leaves the sibling MediaObjectTrait::style method reachable through the same Markdown excerpt-action pipeline, allowing an editor to save Markdown image style parameters that are written into the rendered img style attribute without sanitization. This issue is fixed in version 2.0.0-rc.9.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2
- https://github.com/getgrav/grav/releases/tag/2.0.0-rc.9
- https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54
- https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54
FAQ
What is CVE-2026-55890?
CVE-2026-55890 is a vulnerability with a CVSS score of 4.8 (MEDIUM). Grav is a file-based Web platform. Prior to 2.0.0-rc.9, Grav's incomplete fix for stored XSS through the Markdown media attribute action (CVE-2026-42841) leaves the sibling MediaObjectTrait::style met...
How severe is CVE-2026-55890?
CVE-2026-55890 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-2026-55890?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.