Private-note disclosure via unvalidated OAuth state
Published Jul 13, 2026 · Updated Jul 13, 2026
Cross-site request forgery in HedgeDoc before 1.11.0 allows remote authenticated users to disclose private notes through GitHub Gist export. The GitHub OAuth callback checks only that state is present instead of matching it to the value created for the victim's session, then pairs the victim-selected note with the attacker's authorization code. Exploitation requires GitHub Gist export to be enabled and a logged-in victim to click a crafted callback link, which sends a private, protected, or limited note to an attacker-controlled Gist.
Summary
What happened
Cross-site request forgery in HedgeDoc before 1.11.0 allows remote authenticated users to disclose private notes through GitHub Gist export. The GitHub OAuth callback checks only that state is present instead of matching it to the value created for the victim's session, then pairs the victim-selected note with the attacker's authorization code. Exploitation requires GitHub Gist export to be enabled and a logged-in victim to click a crafted callback link, which sends a private, protected, or limited note to an attacker-controlled Gist.
The record
- CVE
- CVE-2026-58489
- Published
- Jul 13, 2026
- Updated
- Jul 13, 2026
- Vendor
- HedgeDoc
- Product
- HedgeDoc
- Classifications
- CWE-352, T1204.001, T1567.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 13, 2026CVE publishedPublication date reported by the CVE source.
- Jul 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.11.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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