CVE-2026-100635Published

SiYuan before v3.8.4 Authentication Bypass via Plaintext Session Cookie

Exact source revision recorded 27 Oct 2026 03:22:55 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-100635

Published

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 published: 26 Sep 2026 13:23:09 UTC
Source modified: 27 Oct 2026 01:30:29 UTC
Observed here: 27 Oct 2026 03:22:55 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 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

CVSS 3.1 · 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N