CVE-2018-16887 — katello
MEDIUMCVE-2018-16887 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in katello. 1 public exploit reference exists, so weaponization risk is real. A fix is available for katello — see the affected versions and patch details below.
katello Cross-site Scripting vulnerability
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2018-16887 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
katelloReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | katello | all versions | 3.9.0bundle update katello --conservative |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for katello, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update katello to 3.9.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-16887 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2018-16887 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2018-16887. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Red Hat Subscription Asset Manager does not support the Organization Change, and therefore is not affected by this flaw.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Satellite 6.5 for RHEL 7 | ansiblerole-insights-client-0:1.6-1.el7sat | RHSA-2019:1222 |
Frequently Asked Questions
Is CVE-2018-16887 in your dependencies?
O3 Security finds CVE-2018-16887 across RubyGems dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.