Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()

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Summary

CVECVE-2026-55890
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 17:17:00 UTC
Updated2026-07-10 19:17:26 UTC
DescriptionGrav 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.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED4.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Getgrav Grav affected < 2.0.0-rc.9 Not specified

References

ReferenceSourceLinkTags
github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2 [email protected] github.com
github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/getgrav/grav/releases/tag/2.0.0-rc.9 [email protected] github.com
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