CVE-2026-25647 Lute has a Stored Cross-Site Scripting (XSS) via Markdown hyperlink
Attackers can inject malicious JavaScript via Markdown hyperlinks, executing code in victim sessions when rendered.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-25647?
CVE-2026-25647 is a medium-severity cross-site scripting vulnerability in B3log Siyuan, published on 6 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-25647?
It affects 1 product.
Products include B3log Siyuan.
How do I fix CVE-2026-25647?
No fix has been published for CVE-2026-25647 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-25647 being exploited?
There is no known exploitation of CVE-2026-25647 in the wild and no public exploit code.
Other vulnerabilities in B3log Siyuan
- CVE-2026-32938 SiYuan has an Arbitrary File Read in its Desktop Publish Service
- CVE-2026-33669 SiYuan has Arbitrary Document Reading within the Publishing Service
- CVE-2026-33670 SiYuan has directory traversal within its publishing service
- CVE-2026-32767 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API
- CVE-2024-53504 SQL injection in n/a
Sources
Also known as GHSA-rw25-98wq-76qv.