What’s Vulnerable › Vulnerabilities

CVE-2026-58489: HedgeDoc: CSRF in GitHub Gist export callback

• Severity: medium (CVSS 6.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-13 · updated 2026-07-14
• Weakness: CWE-352

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.

Affected products

• hedgedoc: before 1.11.0

References

• https://github.com/hedgedoc/hedgedoc/commit/fbd7307f162754212046ec343cbe691223a48c8d
• https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-8v9p-5j95-826j

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