CVE-2026-25647: b3log siyuan Cross-site Scripting

Vulnerability summary

CVE-2026-25647 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in b3log siyuan. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 06-02-2026
   PublishedVulnerability first disclosed.
2. 09-02-2026
   Last modifiedVulnerability information updated.

Description

Lute is a structured Markdown engine supporting Go and JavaScript. Lute 1.7.6 and earlier (as used in SiYuan before) has a Stored Cross-Site Scripting (XSS) vulnerability in the Markdown rendering engine. An attacker can inject malicious JavaScript into a Markdown text/note. When another user clicks the rendered content, the script executes in the context of their session.

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.