CVE-2026-57303: Jenkins Assembla

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Jenkins Assembla Plugin 1.4 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks, allowing attackers able to control the responses of the configured Assembla server to extract secrets from the Jenkins controller or perform server-side request forgery.

Affected products

• Jenkins Assembla: up to and including 1.4

Published 2026-06-24. Last modified 2026-06-25.