What is CVE-2018-16887?

CVE-2018-16887 is a medium-severity vulnerability in Theforeman Katello, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-01-13.

How severe is CVE-2018-16887?

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

XSS in Theforeman Katello

CVE-2018-16887

A cross-site scripting (XSS) flaw was found in the katello component of Satellite. An attacker with privilege to create/edit organizations and locations is able to execute a XSS attacks against other users through the Subscriptions or the Red Hat Repositories wizards. This can possibly lead to malicious code execution and extraction of the anti-CSRF token of higher privileged users. Versions before 3.9.0 are vulnerable.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-01-13 · 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: 0.010 (62.4th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 62.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Theforeman Katello
The Katello Project — versions 3.9.0
Red Hat Satellite — versions 6.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

bugzilla.redhat.com/show_bug.cgi (Exploit, Patch, Third Party Advisory, Issue Tracking)
access.redhat.com/errata/RHSA-2019:1222 (vendor-advisory)

Frequently asked questions

What is CVE-2018-16887?: CVE-2018-16887 is a medium-severity vulnerability in Theforeman Katello, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-01-13.
How severe is CVE-2018-16887?: Medium severity. CVSS v3 base score is 5.4 out of 10.