CVE-2021-21259: high-severity vulnerability in hedgedoc
Stored XSS in slide mode
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.4epss 1.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Affected products
hedgedoc · hedgedocRelated CVEs — hedgedoc
In the same product, most dangerous first.
CVE-2021-29474MEDIUMRelative Path Traversal Attack on note creationEPSS 1.6%CVE-2020-26287HIGHStored XSS in mermaid diagramsEPSS 1.5%CVE-2020-26286HIGHArbitary file uploadEPSS 1.4%CVE-2021-29475CRITICALPDF export allows arbitrary file readsEPSS 1.2%CVE-2022-24837MEDIUMEnumerable upload file names in hedgedocEPSS 1.1%CVE-2021-29503HIGHImproper Neutralization of Script-Related HTML Tags in NotesEPSS 1.0%