CVE-2025-68948: b3log siyuan Use of Hard-coded Cryptographic Key

Vulnerability summary

CVE-2025-68948 is a high (CVSS 8.1) Use of Hard-coded Cryptographic Key vulnerability in b3log siyuan. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.7% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 27-12-2025
   PublishedVulnerability first disclosed.
2. 29-12-2025
   Last modifiedVulnerability information updated.

Description

SiYuan is self-hosted, open source personal knowledge management software. In versions 3.5.1 and prior, the SiYuan Note application utilizes a hardcoded cryptographic secret for its session store. This unsafe practice renders the session encryption ineffective. Since the sensitive AccessAuthCode is stored within the session cookie, an attacker who intercepts or obtains a user's encrypted session cookie (e.g., via session hijacking) can locally decrypt it using the public key. Once decrypted, the attacker can retrieve the AccessAuthCode in plain text and use it to authenticate or take over the session.

• CWE-321Use of Hard-coded Cryptographic KeyThe product uses a hard-coded, unchangeable cryptographic key.
• CWE-798Use of Hard-coded CredentialsThe product contains hard-coded credentials, such as a password or cryptographic key.