CVE-2026-55890 | THREATINT

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.

PUBLISHED Reserved 2026-06-17 | Published 2026-07-10 | Updated 2026-07-10 | Assigner GitHub_M

MEDIUM: 4.8CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 2.0.0-rc.9

affected

References

github.com/...v/grav/security/advisories/GHSA-pmf8-g7c8-7v54 exploit

github.com/...v/grav/security/advisories/GHSA-pmf8-g7c8-7v54

github.com/...ommit/24fd6cbc438e12310b126d1176e7d7601203a6f2

github.com/getgrav/grav/releases/tag/2.0.0-rc.9

cve.org (CVE-2026-55890)

nvd.nist.gov (CVE-2026-55890)

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