Vulnerability Description
SiYuan before v3.8.4 contains an authentication bypass vulnerability in the publish service where session cookies are issued without Secure or SameSite attributes over plaintext HTTP connections. An on-path attacker can observe a valid publish-visitor-session-id cookie from a Basic Auth exchange and replay it to access authenticated publish endpoints without knowing the account password.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/commit/79d47867b106467c951475a9193455b48d1
- https://github.com/siyuan-note/siyuan/commit/ff4d215f78a8d6e6db6052be18b5f9f4db9
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m
- https://www.vulncheck.com/advisories/siyuan-before-3.8.4-authentication-bypass-v
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m
FAQ
What is CVE-2026-100635?
CVE-2026-100635 is a vulnerability with a CVSS score of 5.9 (MEDIUM). SiYuan before v3.8.4 contains an authentication bypass vulnerability in the publish service where session cookies are issued without Secure or SameSite attributes over plaintext HTTP connections. An o...
How severe is CVE-2026-100635?
CVE-2026-100635 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-100635?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.