Vulnerability · Published May 28, 2026 · Assigned by CIRCL
CVE-2026-9806Stored Cross-Site Scripting (XSS) in CTI Transmute Notification Panel via Malicious Convert Names
Medium 6.3
In plain English
A medium-severity cross-site scripting in cti-transmute from misp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| misp | cti-transmute | see references |
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/S:N/RE:L/U:Clear