CVE-2026-9806

MEDIUM

Stored Cross-Site Scripting (XSS) in CTI Transmute Notification Panel via Malicious Convert Names

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-9806. PoCs published by aj2108.

AI-analyzed exploit summary Detailed technical analysis of CVE-2026-9806, a Stored XSS vulnerability in CTI Transmute's notification panel. The writeup explains the root cause (unsanitized user-controlled input rendered via innerHTML), attack flow, and provides conceptual vulnerable/safe code patterns without including functional exploit code.

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.

Exploits (1)

github WRITEUP
by aj2108 · poc
https://github.com/aj2108/CVE-2026-9806

Detailed technical analysis of CVE-2026-9806, a Stored XSS vulnerability in CTI Transmute's notification panel. The writeup explains the root cause (unsanitized user-controlled input rendered via innerHTML), attack flow, and provides conceptual vulnerable/safe code patterns without including functional exploit code.

Classification
Writeup 99%
Attack Type
Xss
Complexity
Moderate
Reliability
Reliable
Target: CTI Transmute (versions prior to patched release)
Auth required
Prerequisites: Attacker must be able to create/influence a convert name · Victim must be authenticated and open the notification panel
mistral-large-3 · analyzed Aug 03, 2026 Full analysis →

Scores

CVSS v4 6.3
EPSS 0.0026
EPSS Percentile 17.3%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:X/R:X/V:X/RE:L/U:Clear

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (1)
misp/cti-transmute 1.0 - 1.3.0
Published May 28, 2026
Tracked Since May 28, 2026