CVE-2026-100635 — SiYuan before v3.8.4 Authentication Bypass via Plaintext Session Cookie
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…
Published: 2026-09-26 · CVSS: 8.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7