What is CVE-2018-1539?

CVE-2018-1539 is a medium-severity vulnerability in IBM Rational Engineering Lifecycle Manager, classified under Improper Authentication. CVSS score: 5.4/10. Published 2018-09-25.

How severe is CVE-2018-1539?

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

Auth bypass in IBM Rational Engineering Lifecycle Manager

CVE-2018-1539

IBM Rational Engineering Lifecycle Manager 5.0 through 5.02 and 6.0 through 6.0.6 could allow remote attackers to bypass authentication via a direct request or forced browsing to a page other than URL intended. IBM X-Force ID: 142561.

Vulnerability class: Broken Authentication

Published 2018-09-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

IBM Rational Engineering Lifecycle Manager — versions 6.0.2, 5.02, 6.0.6
IBM Rational Engineering Lifecycle Manager

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

exchange.xforce.ibmcloud.com/vulnerabilities/142561 (VDB Entry, vdb-entry, Vendor Advisory)
www.ibm.com/support/docview.wss (Vendor Advisory)

Frequently asked questions

What is CVE-2018-1539?: CVE-2018-1539 is a medium-severity vulnerability in IBM Rational Engineering Lifecycle Manager, classified under Improper Authentication. CVSS score: 5.4/10. Published 2018-09-25.
How severe is CVE-2018-1539?: Medium severity. CVSS v3 base score is 5.4 out of 10.