Unauthorized actions via unchecked CheckAuth requests
Published Aug 17, 2026 · Updated Aug 18, 2026
Cross-site request forgery in SiYuan before 3.7.4 allows remote attackers to perform unauthorized actions via malicious cross-site requests. In CheckAuth(), the session-cookie authentication branch accepts requests with a valid session cookie but performs no Origin or Referer validation, while the cookie is issued without an explicit SameSite attribute. Exploitation requires an authenticated browser session and user interaction with an attacker-controlled page; the resulting impact is limited to actions and data exposure available to that session.
Summary
What happened
Cross-site request forgery in SiYuan before 3.7.4 allows remote attackers to perform unauthorized actions via malicious cross-site requests. In CheckAuth(), the session-cookie authentication branch accepts requests with a valid session cookie but performs no Origin or Referer validation, while the cookie is issued without an explicit SameSite attribute. Exploitation requires an authenticated browser session and user interaction with an attacker-controlled page; the resulting impact is limited to actions and data exposure available to that session.
The record
- CVE
- CVE-2026-74867
- Published
- Aug 17, 2026
- Updated
- Aug 18, 2026
- Vendor
- SiYuan Note
- Product
- SiYuan
- Classifications
- CWE-1275, CWE-352
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 17, 2026CVE publishedPublication date reported by the CVE source.
- Aug 18, 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=0 <3.7.4
What conditions does exploitation require?
What is affected?
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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