CVE-2026-40201 @diplodoc/search-extension allows stored XSS via Markdown file title
Stored XSS in @diplodoc/search-extension allows attackers to execute scripts via malicious Markdown titles, affecting users of the library.
- 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
- Available
What is CVE-2026-40201?
CVE-2026-40201 is a medium-severity cross-site scripting vulnerability in diplodoc-platform @diplodoc/search-extension, published on 1 May 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
@diplodoc/search-extension 1.0.0 through 3.x before 3.0.3 allows stored XSS via the title in a .md file.
Weakness: CWE-79
Which versions are affected by CVE-2026-40201?
2 open source packages ship an affected version, including @diplodoc/search-extension.
| Package | Affected | Fixed in |
|---|---|---|
@diplodoc/search-extension npm | From 1.0.0 | 3.0.5 |
@diplodoc/search-extension npm | From 1.0.0 | 3.0.5 |
How do I fix CVE-2026-40201?
Upgrade @diplodoc/search-extension to 3.0.5 or later.
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-2026-40201 being exploited?
There is no known exploitation of CVE-2026-40201 in the wild and no public exploit code.
Sources
Also known as GHSA-rjmp-rwj4-mv82.