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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/siyuan-note/siyuan/commit/79d47867b106467c951475a9193455b48d…
disclosure@vulncheck.com
https://github.com/siyuan-note/siyuan/commit/ff4d215f78a8d6e6db6052be18b5f9f4db…
disclosure@vulncheck.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-3.8.4-authentication-bypass-…
disclosure@vulncheck.com