Vulnerability Description
HedgeDoc is an open source, real-time collaborative markdown notes application. Prior to 1.11.0, the GitHub Gist export flow created an OAuth2 state value but only checked that it was present rather than validating it against the value expected for the user's session. Because the state was not properly validated, an attacker could forge a callback URL containing their own valid GitHub OAuth code. When processing the callback, HedgeDoc used the victim's logged-in session to select which note to export, but the attacker's authorization code to determine which GitHub account received it. As a result, a logged-in victim who clicked a crafted link could export their own private, protected, or limited note directly into a Gist controlled by the attacker. This issue has been fixed in version 1.11.0.
Related Weaknesses (CWE)
References
- https://github.com/hedgedoc/hedgedoc/commit/fbd7307f162754212046ec343cbe691223a4
- https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-8v9p-5j95-826j
FAQ
What is CVE-2026-58489?
CVE-2026-58489 is a documented vulnerability. HedgeDoc is an open source, real-time collaborative markdown notes application. Prior to 1.11.0, the GitHub Gist export flow created an OAuth2 state value but only checked that it was present rather...
How severe is CVE-2026-58489?
CVSS scoring is not yet available for CVE-2026-58489. Check NVD for updates.
Is there a patch for CVE-2026-58489?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.