CVE-2026-56098Rubygem-katello: improper authorization logic allows resource enumeration
- 4.3MediumCVSS base score
- 0.32%Exploitation in 30 daysEPSS · top 74% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A flaw was found in rubygem-katello. The RegistryProxiesController in Katello contains an authorization bypass vulnerability due to an execution fall-through in the registry_authorize filter. While the application identifies unauthorized requests and triggers an error response via the unauthorized method, it fails to halt the execution of the current code path (missing return statement). This failure in the control flow allows the application to proceed into subsequent business logic and database validation filters. Consequently, the application reveals its internal state through differential responses, allowing an unprivileged attacker to enumerate valid Users, Organizations, and Products across the entire instance.
Timeline
ID reserved
By redhat
- 4 months later
· 4 months later
Published
- 6 days later
· 6 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVDNVD · Awaiting Analysis | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.32% · top 74% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Affected products
Red Hat · Red Hat Satellite 6.16 for RHEL 8
- unaffected 0:4.14.0.23-1.el8sat – < *
Red Hat · Red Hat Satellite 6.16 for RHEL 9
- unaffected 0:4.14.0.23-1.el9sat – < *
Red Hat · Red Hat Satellite 6.17 for RHEL 9
- unaffected 0:4.16.0.20-1.el9sat – < *
Red Hat · Red Hat Satellite 6.18 for RHEL 9
- unaffected 0:4.18.0.24-1.el9sat – < *
Red Hat · Red Hat Satellite 6.19 for RHEL 9
- unaffected 0:4.20.0.11-1.el9sat – < *
All versions: affected
All versions: affected
What to do
Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
References7
- RHSA-2026:74503 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:74504 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:74505 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:74506 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-56098 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2490542 (opens in a new tab)issue-trackingx_refsource_REDHAT
- http://www.openwall.com/lists/oss-security/2026/10/07/3 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-90971 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-56098)Record last updated .