CVE-2026-55890 | Grav is a file-based Web platform. Prior to 2.0.0-rc.9, Grav… | CVSS 4.8 MEDIUM

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.

Metadata

CVE ID: CVE-2026-55890
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-17 16:59 UTC
Published: 2026-07-10 16:17 UTC
Last updated: 2026-07-10 18:39 UTC
Primary CWE: CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product: getgrav / grav
Sources: cve.org · NVD

Severity & Metrics

4.8 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
getgrav	grav	—	< 2.0.0-rc.9

Weakness (CWE)

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

CVSS scores (1)

Score	Severity	Version	Source	Vector
4.8	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

References (3)

https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54 https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54
https://github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2 https://github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2
https://github.com/getgrav/grav/releases/tag/2.0.0-rc.9 https://github.com/getgrav/grav/releases/tag/2.0.0-rc.9