CVE-2026-100635
SiYuan before v3.8.4 contains an authentication bypass vulnerability in the publish service where…
- Risk score
- 40/100
- CVSS
- 5.9 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 26 Sep 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 acces…
- Affected
- See advisory
- Fix
- Upgrade the product to 3.8.4 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 5.9 medium
References
- https://github.com/siyuan-note/siyuan/commit/79d47867b106467c951475a9193455b48d1f3682
- https://github.com/siyuan-note/siyuan/commit/ff4d215f78a8d6e6db6052be18b5f9f4db9c7d68
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m
- https://www.vulncheck.com/advisories/siyuan-before-3.8.4-authentication-bypass-via-plaintext-session-cookie
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m
Original 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.
Last activity 26 Sep 2026. Patch Forecast updates every hour.