CVE-2026-55890

Summary

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 Software

Weaknesses

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

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54

References

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

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