CVE-2024-38354: Cross-site Scripting in Hackmd.io Notes lead by HTML Injection

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-07-10 · updated 2026-06-17
Weakness: CWE-79

Description

CodiMD allows realtime collaborative markdown notes on all platforms. The notebook feature of Hackmd.io permits the rendering of iframe `HTML` tags with an improperly sanitized `name` attribute. This vulnerability enables attackers to perform cross-site scripting (XSS) attacks via DOM clobbering. This vulnerability is fixed in 2.5.4.

Affected products

hackmdio codimd: before 2.5.4 — fixed in 2.5.4

How to fix

Upgrade to a fixed version: hackmdio codimd 2.5.4. Check the vendor advisory for mitigations.

References

https://github.com/hackmdio/codimd/security/advisories/GHSA-22jv-vch8-2vp9
https://github.com/hackmdio/codimd/security/advisories/GHSA-22jv-vch8-2vp9

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