What is CVE-2019-4539?

CVE-2019-4539 is a high-severity vulnerability in IBM Security Directory Server, classified under XML Injection (Blind XPath Injection). CVSS score: 7.1/10. Published 2019-10-02.

How severe is CVE-2019-4539?

High severity. CVSS v3 base score is 7.1 out of 10.

XPath Injection in IBM Security Directory Server

CVE-2019-4539

IBM Security Directory Server 6.4.0 does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system. IBM X-Force ID: 165812.

Published 2019-10-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.012 (68.5th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

IBM Security Directory Server — versions 6.4.0
IBM Security Directory Server — versions 6.4.0

Weakness classification (CWE)

CWE-91 — XML Injection (Blind XPath Injection)

References

www.ibm.com/support/pages/node/1077045 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/165812 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2019-4539?: CVE-2019-4539 is a high-severity vulnerability in IBM Security Directory Server, classified under XML Injection (Blind XPath Injection). CVSS score: 7.1/10. Published 2019-10-02.
How severe is CVE-2019-4539?: High severity. CVSS v3 base score is 7.1 out of 10.