HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. As a workaround, disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
| Link | Tags |
|---|---|
| https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-44w9-vm8p-3cxw | third party advisory |
| https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.2 | third party advisory release notes |
| https://github.com/hedgedoc/hedgedoc/commit/35b0d39a12aa35f27fba8c1f50b1886706e7efef | third party advisory patch |
| https://github.com/hackmdio/codimd/issues/1648 | patch third party advisory exploit |