CVE-2026-9806 Stored Cross-Site Scripting (XSS) in CTI Transmute Notification Panel via Malicious Convert Names
Stored XSS in CTI Transmute allows attackers to inject JavaScript via malicious convert names, executing code in authenticated users' browsers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-9806?
CVE-2026-9806 is a medium-severity cross-site scripting vulnerability in misp cti-transmute, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A stored cross-site scripting (XSS) vulnerability exists in the notification panel of CTI Transmute in versions prior to the patched release. Notification messages containing user-controlled convert names were rendered in the notification bell dropdown using innerHTML without adequate sanitization. An attacker able to create or influence a convert name that is included in a notification could inject arbitrary JavaScript, which would execute in the browser of an authenticated user when they opened the notification panel. Successful exploitation could allow the attacker to perform actions in the victim's session or access information available to the application in the browser context. The issue was remediated by constructing notification elements through DOM methods and assigning notification message content via textContent instead of innerHTML. This vulnerability was only present on a development branch.
Weakness: CWE-79
Which versions are affected by CVE-2026-9806?
How do I fix CVE-2026-9806?
No fix has been published for CVE-2026-9806 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-2026-9806 being exploited?
There is no known exploitation of CVE-2026-9806 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-w9rm-vvqp-qq3h.