CVE-2026-100635

SiYuan before v3.8.4 Authentication Bypass via Plaintext Session Cookie

Published: Sep 26, 2026Updated: Sep 26, 2026 Sources: CVE List NVDCWE-319

5.9MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:NIntegrity

None

A:NAvailability

None

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Weaknesses

CWE-319

Affected Products

siyuan-note

commercial

siyuanOn-premDesktop App

Consumer Software / productivity

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Collection

Credential Access

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References

https://github.com/siyuan-note/siyuan/commit/79d47867b106467c951475a9193455b48d1f3682

github.com

https://github.com/siyuan-note/siyuan/commit/ff4d215f78a8d6e6db6052be18b5f9f4db9c7d68

github.com

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m

github.com

and 1 more references View all →

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