Medium · CVSS 6.1CVE-2026-2102

XSS in wrensec-commons CREST framework HTTP binding via _mimeType parameterCVE-2026-2102

Answer in brief

CVE-2026-2102 records a Medium severity (CVSS 6.1) vulnerability in XSS in wrensec-commons CREST framework HTTP binding via _mimeType parameter. The current sources do not mark it as known exploited. The current feed maps Wren Security/org.wrensecurity.commons:json-resource-http (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 2, 2026Updated Nov 2, 2026Source checked Nov 2, 2026First seen by HOL Nov 2, 2026Material review Nov 2, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Wren Security/org.wrensecurity.commons:json-resource-http (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Wren Security/org.wrensecurity.commons:json-resource-httpgeneric	>=0 <22.6.2 \|\| >=23.0.0-M1 <23.0.0	22.6.2, 23.0.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Wren Security/org.wrensecurity.commons:json-resource-http.
Review the reported fix. Source-reported workaround: Disallow the _mimeType request parameter in both query string and x-www-form-urlencoded request bodies.

Evidence timeline and material changes

Published upstream
Nov 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 2, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

An Otter Wiki before 2.26.2 Stored XSS via Math Code BlockAlso CWE-79