CVE-2025-46655: Hackmd Codimd

Medium severity, CVSS 4.9. EPSS: 0.2% chance of exploitation in the next 30 days.

CodiMD through 2.5.4 has a CSP-based protection mechanism against XSS through uploaded SVG documents containing JavaScript, but it can be bypassed in certain cases of different-origin file storage, such as AWS S3. NOTE: it can be considered a user error if AWS is employed for hosting untrusted JavaScript content, but the selected architecture within AWS does not have components that are able to insert Content-Security-Policy headers.

Affected products

• Hackmd Codimd: up to and including 2.5.4

Published 2025-04-26. Last modified 2026-06-17.