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.

### Workarounds
Disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content.

### References
This issue was discovered by @TobiasHoll and reported to hackmdio/codimd:

### For more information
If you have any questions or comments about this advisory:
* Open an topic on our community forum
* Join our matrix room

Source: CVE-2021-21259

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