---
id: CVE-2026-2102
title: XSS in wrensec-commons CREST framework HTTP binding via _mimeType parameter
summary: >-
  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
  with…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: Wren Security
product: 'org.wrensecurity.commons:json-resource-http'
affected:
  - 'org.wrensecurity.commons:json-resource-http < 22.6.2'
  - 'org.wrensecurity.commons:json-resource-http >= 23.0.0-M1 < 23.0.0'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-02T16:14:26.559086Z'
published: '2026-11-02'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T16:14:41.537Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-2102'
references:
  - url: >-
      https://github.com/WrenSecurity/wrensec-commons/security/advisories/GHSA-4vhv-49g2-496q
    label: GitHub Security Advisory GHSA-4vhv-49g2-496q
  - url: >-
      https://github.com/WrenSecurity/wrensec-commons/commit/65bbfd8c63c42e84ff7699aa5b82a22c08a12624
    label: >-
      Fix commit (23.x): Remove implicit support for _mimeType parameter to
      prevent XSS attacks
  - url: >-
      https://github.com/WrenSecurity/wrensec-commons/commit/5b50c64c14943b6f4d7faf996345e603956bae1d
    label: >-
      Fix commit (22.x backport): Remove implicit support for _mimeType
      parameter to prevent XSS attacks
tags:
  - cve.org
epss: 0.00273
epssPercentile: 0.1974
ingestedAt: '2026-11-05T19:30:42.705Z'
---

## Overview

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

- `org.wrensecurity.commons:json-resource-http < 22.6.2`
- `org.wrensecurity.commons:json-resource-http >= 23.0.0-M1 < 23.0.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Disallow the _mimeType request parameter in both query string and x-www-form-urlencoded request bodies.