CVE-2026-12515 is a medium-severity (CVSS 4.3) CWE-862 vulnerability in katello. A fix is available for katello — see the affected versions and patch details below.
katello: missing repository authorization in content_uploads exposes cross-product content existence
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-12515.
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-2026-12515 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 377,166 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 flaw was found in Katello's of Red Hat Satellite. A content upload functionality where insufficient authorization checks in the ContentUploadsController allowed users with the edit_products permission to query content information for repositories outside the products they were authorized to manage. An authenticated attacker could exploit this issue to determine whether specific content exists within repositories that should otherwise be inaccessible. This issue does not allow unauthorized modification, import, or publication of content.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | katello | all versions | 4.21.0.rc1bundle update katello --conservative |
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 4.21.0.rc1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-12515 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-2026-12515 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-12515. 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.
This vulnerability affects Katello's content upload API authorization handling. Red Hat Product Security has assessed this issue as a Moderate severity vulnerability. Katello's content_uploads API does not properly enforce repository authorization checks when processing upload requests. A user with product-filtered…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Satellite 6.16 for RHEL 8 | rubygem-katello-0:4.14.0.21-1.el8sat | RHSA-2026:50223 |
| Red Hat Satellite 6.17 for RHEL 9 | rubygem-katello-0:4.16.0.18-1.el9sat | RHSA-2026:50222 |
| Red Hat Satellite 6.18 for RHEL 9 | rubygem-katello-0:4.18.0.15-1.el9sat | RHSA-2026:50263 |
| Red Hat Satellite 6.19 for RHEL 9 | rubygem-katello-0:4.20.0.7-1.el9sat | RHSA-2026:50221 |
Frequently Asked Questions
Is CVE-2026-12515 in your dependencies?
O3 Security finds CVE-2026-12515 across RubyGems dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.