What is CVE-2026-57304?

CVE-2026-57304 is a medium-severity vulnerability in Jenkins Assembla, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-06-24.

How severe is CVE-2026-57304?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Jenkins Assembla

CVE-2026-57304

A missing permission check in Jenkins Assembla Plugin 1.4 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using an attacker-specified username and password.

Vulnerability class: Broken Access Control

Published 2026-06-24 · last modified 2026-06-25.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (15.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Jenkins Assembla
Jenkins Project Assembla Plugin — versions 0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

www.jenkins.io/security/advisory/2026-06-24/ (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-57304?: CVE-2026-57304 is a medium-severity vulnerability in Jenkins Assembla, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-06-24.
How severe is CVE-2026-57304?: Medium severity. CVSS v3 base score is 5.4 out of 10.