Medium severity · published Jul 10, 2026
CVE-2026-55890
Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()
4.8
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav · getgrav
< 2.0.0-rc.9 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55890
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55890
github.com
https://github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2
github.com
https://github.com/getgrav/grav/releases/tag/2.0.0-rc.9
github.com
https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54
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