What is CVE-2020-2255?

CVE-2020-2255 is a medium-severity vulnerability in Jenkins Blue Ocean, classified under Missing Authorization. CVSS score: 4.3/10. Published 2020-09-16.

How severe is CVE-2020-2255?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Jenkins Blue Ocean

CVE-2020-2255

A missing permission check in Jenkins Blue Ocean Plugin 1.23.2 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL.

Vulnerability class: Broken Access Control

Published 2020-09-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (56.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Jenkins Blue Ocean
Jenkins Project Blue Ocean Plugin — versions unspecified, 1.19.2

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

www.jenkins.io/security/advisory/2020-09-16/ (Vendor Advisory)
www.openwall.com/lists/oss-security/2020/09/16/3 (mailing-list, Third Party Advisory)

Frequently asked questions

What is CVE-2020-2255?: CVE-2020-2255 is a medium-severity vulnerability in Jenkins Blue Ocean, classified under Missing Authorization. CVSS score: 4.3/10. Published 2020-09-16.
How severe is CVE-2020-2255?: Medium severity. CVSS v3 base score is 4.3 out of 10.