CVE-2026-9806
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Stored XSS in CTI Transmute Notification Panel

Publication date: 2026-05-28

Last updated on: 2026-05-28

Assigner: 5a6e4751-2f3f-4070-9419-94fb35b644e8

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.
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Meta Information
Published
2026-05-28
Last Modified
2026-05-28
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-16
NVD
CVE-2026-9806
EUVD
EUVD-2026-32728
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
misp cti_transmute to patched (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 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.
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Executive Summary

This vulnerability is a stored cross-site scripting (XSS) issue found in the notification panel of CTI Transmute before a certain patch was applied.

Specifically, notification messages that included user-controlled convert names were rendered using innerHTML without proper sanitization, allowing attackers who could create or influence these convert names to inject arbitrary JavaScript.

When an authenticated user opened the notification panel, the malicious script would execute in their browser.

The vulnerability was fixed by changing the way notification elements are constructed, using DOM methods and assigning content via textContent instead of innerHTML to prevent script execution.

Impact Analysis

Exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript in the browser of an authenticated user.

This could enable the attacker to perform actions on behalf of the victim within their session or access sensitive information available to the application in the browser context.

Mitigation Strategies

To mitigate this stored cross-site scripting (XSS) vulnerability in the notification panel of CTI Transmute, you should update to the patched version where the issue is fixed.

  • Apply the fix that rebuilds notification items using DOM methods like textContent instead of innerHTML to prevent script execution.
  • Ensure that notification messages are constructed safely to avoid rendering user-controlled content as executable code.
  • Verify that the notification bell panel fetches only unread notifications to reduce exposure.
Compliance Impact

The provided information does not specify how this stored cross-site scripting (XSS) vulnerability in CTI Transmute impacts compliance with common standards and regulations such as GDPR or HIPAA.

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