Vulnerability · Published Nov 2, 2026 · Assigned by WrenSecurity
CVE-2026-2102XSS in wrensec-commons CREST framework HTTP binding via _mimeType parameter
Medium 6.1
In plain English
A medium-severity cross-site scripting in wrensec-commons from Wren Security. 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 20% of all known vulnerabilities).
Official description
wrensec-commons contains a reflected cross-site scripting (XSS) vulnerability in the CREST framework's HTTP binding. The HttpUtils.prepareResponse() method used the _mimeType request parameter to set the Content-Type response header without proper sanitization. By sending a GET request with _mimeType=text/html, an attacker could cause the browser to interpret a CREST JSON response as HTML, enabling execution of arbitrary JavaScript in the victim's browser. The vulnerability is exploitable by tricking a user into visiting a crafted URL targeting any deployed CREST endpoint. The issue is fixed in versions 22.6.2 and 23.0.0.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wren Security | wrensec-commons | 0 – before 22.6.223.0.0-M1 – before 23.0.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N