Session Hijacking Vulnerability in SiYuan Note Application
CVE-2025-68948

6.9MEDIUM

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
27 December 2025

What is CVE-2025-68948?

The SiYuan Note application, a self-hosted and open source personal knowledge management tool, has a vulnerability in its session management. In versions 3.5.1 and earlier, the application employs a hardcoded cryptographic secret for its session store, compromising the effectiveness of session encryption. Sensitive information, specifically the AccessAuthCode, is stored within the session cookie. If an attacker intercepts or acquires a user's encrypted session cookie, they can exploit this vulnerability to decrypt the cookie locally using a public key. This gives the attacker access to the AccessAuthCode in plain text, potentially enabling them to hijack or take over the session.

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Affected Version(s)

siyuan <= 3.5.1

References

https://github.com/siyuan-note/siyuan/security/advisories...
x_refsource_CONFIRM

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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