CVE-2026-100635
MEDIUMCVSS 5.9Description
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.
Timeline
Published:September 26th, 2026 2:16 PM
Last modified:September 28th, 2026 7:16 PM
CVSS Scoring
CVSS v3: 5.9 (MEDIUM)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- 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
Source: NIST NVD · Data may lag official sources by up to one minute