CVE-2026-55890
MEDIUMGrav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54
X_Refsource_Misc x_refsource_misc
https://github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2
X_Refsource_Misc x_refsource_misc
https://github.com/getgrav/grav/releases/tag/2.0.0-rc.9
Scores
CVSS v3
4.8
EPSS
0.0019
EPSS Percentile
8.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (1)
getgrav/grav
< 2.0.0-rc.9
Published
Jul 10, 2026
Tracked Since
Jul 10, 2026