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Vulnerability Details CVE-2021-21259

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 50.2%
CVSS Severity
CVSS v3 Score 7.4
CVSS v2 Score 4.3
Products affected by CVE-2021-21259


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