CVE-2026-100635
8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| siyuan-note | siyuan | 0 < 3.8.4 | affected |
| siyuan-note | siyuan | 3.8.4 | unaffected |
Weaknesses
- CWE-319: Cleartext Transmission of Sensitive Information
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m
- https://github.com/siyuan-note/siyuan/commit/79d47867b106467c951475a9193455b48d1f3682
- https://github.com/siyuan-note/siyuan/commit/ff4d215f78a8d6e6db6052be18b5f9f4db9c7d68
- https://www.vulncheck.com/advisories/siyuan-before-3.8.4-authentication-bypass-via-plaintext-session-cookie
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