CVE-2021-29503

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Summary

CVECVE-2021-29503
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-05-19 20:15:00 UTC
Updated2022-04-25 20:09:00 UTC
DescriptionHedgeDoc is a platform to write and share markdown. HedgeDoc before version 1.8.2 is vulnerable to a cross-site scripting attack using the YAML-metadata of a note. An attacker with write access to a note can embed HTML tags in the Open Graph metadata section of the note, resulting in the frontend rendering the script tag as part of the `<head>` section. Unless your instance prevents guests from editing notes, this vulnerability allows unauthenticated attackers to inject JavaScript into notes that allow guest edits. If your instance prevents guests from editing notes, this vulnerability allows authenticated attackers to inject JavaScript into any note pages they have write-access to. This vulnerability is patched in version 1.8.2. As a workaround, one can disable guest edits until the next update.

Risk And Classification

Problem Types: CWE-79

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Hedgedoc Hedgedoc All All All All

References

ReferenceSourceLinkTags
Improper Neutralization of Script-Related HTML Tags in Notes · Advisory · hedgedoc/hedgedoc · GitHub CONFIRM github.com
Merge pull request from GHSA-gjg7-4j2h-94fq · hedgedoc/hedgedoc@01dad58 · GitHub MISC github.com
Release HedgeDoc 1.8.2 · hedgedoc/hedgedoc · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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