What’s Vulnerable › Vulnerabilities

CVE-2026-55890: Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-79

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.

Affected products

• getgrav grav: before 2.0.0-rc.9

References

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

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