Jenkins Assembla Plugin has an XXE vulnerability (CVE-2026-57303) | HOL Guard CVE

High · CVSS 7.1CVE-2026-57303GHSA-2Q27-6P2H-Q6R3

Jenkins Assembla Plugin has an XXE vulnerability

Answer in brief

CVE-2026-57303 records a High severity (CVSS 7.1) vulnerability in Jenkins Assembla Plugin has an XXE vulnerability. The current sources do not mark it as known exploited. The current feed maps org.jenkins-ci.plugins:assembla (maven). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Jun 24, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Jun 24, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.1. 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 org.jenkins-ci.plugins:assembla (maven). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
org.jenkins-ci.plugins:assemblamaven	<=1.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for org.jenkins-ci.plugins:assembla.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 24, 2026
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Jun 24, 2026

Sources and claim methodology

Upstream source description

Jenkins Assembla Plugin 1.4 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks when parsing responses from the configured Assembla server. This allows attackers able to control the responses of the configured Assembla server to extract secrets from the Jenkins controller or perform server-side request forgery. As of publication of this advisory, there is no fix.

Quoted source text, attributed separately from HOL analysis.