CVE-2021-21259

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Summary

CVECVE-2021-21259
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-01-22 17:15:00 UTC
Updated2021-06-08 14:36:00 UTC
DescriptionHedgeDoc 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.

Risk And Classification

Problem Types: CWE-79

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Hedgedoc Hedgedoc All All All All
Application Hedgedoc Hedgedoc All All All All

References

ReferenceSourceLinkTags
Stored XSS in slide mode · Advisory · hedgedoc/hedgedoc · GitHub CONFIRM github.com Third Party Advisory
Stored XSS in slide mode (via reveal-markdown) · Issue #1648 · hackmdio/codimd · GitHub MISC github.com
added sanitation to the slideMode in frontmatter · hedgedoc/hedgedoc@35b0d39 · GitHub MISC github.com Patch, Third Party Advisory
Release HedgeDoc 1.7.2 · hedgedoc/hedgedoc · GitHub MISC github.com Release Notes, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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