CVE-2026-100635

MediumCVSS 5.9/10Last modified Oct 8, 2026

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-319

Affected software

Vendor	Product	Versions
siyuan-note	siyuan	< 3.8.4

References

Timeline

Published: Sep 26, 2026
Last modified: Oct 8, 2026
NVD status: Deferred

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