CVE
Red Hat Satellite IDOR in Candlepin allows cross-organization registration
- Exploited
- No known exploitation
- Fix
- See vendor advisory
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Candlepin in Red Hat Satellite 6.16 (RHEL 8 and 9) or 6.17 (RHEL 9), as listed in the errata Attacker holds a valid consumer identity certificate and the key of the target organization SSL client authentication enabled, which is the default
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.23% · 14th percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 30/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Red Hat Satellite 6 (candlepin package) has a missing authorization check that lets a remote attacker with low privileges and a valid consumer certificate for one organization register a new consumer in a different organization, without any user action. The attacker can then view that organization's subscription pools and, if it does not use simple content access, attach its entitlements to the new consumer.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
A missing authorization check has been found in ConsumerResource.setupOwner() function of consumer registration module in the Candlepin package. The registration method checks permission to create a consumer only when the caller is a user. A consumer that authenticates with its identity certificate does not go through that check. A low-privileged network attacker or user who has a valid consumer certificate for one organization can register a new consumer in a different organization by supplying that organization's key. The response includes an identity certificate for the new consumer. With that certificate, the attacker can view the target organization's subscription pools. When the organization is not using simple content access, the attacker can attach that organization's entitlements to the new consumer.
Who should check
Teams running Red Hat Satellite 6.16 (RHEL 8 or 9) or 6.17 (RHEL 9) with Candlepin, where consumer certificates are in use.
Read the source excerpt
“An update is now available for Red Hat Satellite 6.16 for RHEL 8 and RHEL 9.”
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach10/20Shipped in major Linux distributions
- Severity7.1/10CVSS 7.1
- No patch5/5No fixed version listed; see vendor advisory
What would change the score
- Would score about 80 if added to CISA KEV
- Would score about 75 if CISA's SSVC rates exploitation active
- Would score about 37 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
Candlepin in Red Hat Satellite 6.16 (RHEL 8 and 9) or 6.17 (RHEL 9), as listed in the errata Attacker holds a valid consumer identity certificate and the key of the target organization SSL client authentication enabled, which is the defaultWorkaround: Restricting which clients can reach the Candlepin port limits who can attempt the call, but does not stop a client that already has a valid consumer certificate.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-111456 (Candlepin: consumer certificate can register systems in another organization), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-111456 (entry last updated 2026-11-12):
Affected:
- Red Hat Red Hat Satellite 6.16 for RHEL 8: version range not reported
- Red Hat Red Hat Satellite 6.16 for RHEL 9: version range not reported
- Red Hat Red Hat Satellite 6.17 for RHEL 9: version range not reported
- Red Hat Red Hat Satellite 6.18 for RHEL 9: version range not reported
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- Candlepin in Red Hat Satellite 6.16 (RHEL 8 and 9) or 6.17 (RHEL 9), as listed in the errata (source: https://access.redhat.com/errata/RHSA-2026:99949)
- Attacker holds a valid consumer identity certificate and the key of the target organization (source: https://bugzilla.redhat.com/show_bug.cgi?id=2553939)
- SSL client authentication enabled, which is the default (source: https://bugzilla.redhat.com/show_bug.cgi?id=2553939)
Setup: the bug is reachable in a default setup; no special feature or setting is needed.
Attacker needs: network access, low-privilege login, no user action.
Workaround: Restricting which clients can reach the Candlepin port limits who can attempt the call, but does not stop a client that already has a valid consumer certificate. (source: https://access.redhat.com/errata/RHSA-2026:99949)
CISA KEV: CVE-2026-111456 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-111456 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://access.redhat.com/errata/RHSA-2026:99949
- https://access.redhat.com/errata/RHSA-2026:99950
- https://access.redhat.com/errata/RHSA-2026:99952
- https://bugzilla.redhat.com/show_bug.cgi?id=2553939
- https://access.redhat.com/security/cve/CVE-2026-111456
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-111456
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-111456"}.Timeline
- CVE published
- First seen by cve.now
- Record last updated
Affected versions
- candlepin
Version range not reported
- candlepin
Version range not reported
- candlepin
Version range not reported
- candlepin
Version range not reported
Evidence 7
Vendor advisory · 5
Establishes: Affected and fixed versions.
- Advisory
- Advisory
- Advisory
- Report
- Link
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-111456
Is CVE-2026-111456 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A holder of a valid consumer identity certificate can register a new consumer in another organization. That new certificate then lets the holder list the organization's subscription pools and, where simple content access is not used, attach its entitlements.Source: access.redhat.com, bugzilla.redhat.com
Am I affected, and how do I check?
The errata covers Candlepin in Red Hat Satellite 6.16 for RHEL 8 and RHEL 9 and Satellite 6.17 for RHEL 9. The call needs a valid consumer identity certificate and the target organization's key, and SSL client authentication is enabled by default. Check the installed Satellite version and whether SSL client authentication is enabled.Source: access.redhat.com, bugzilla.redhat.com
How do I fix CVE-2026-111456?
Apply the Red Hat Satellite 6.16 errata that ships candlepin-4.4.26-2.el9sat.src.rpm. The checked facts name no fixed version number or patch IDs beyond that package.Source: access.redhat.com, bugzilla.redhat.com
What if there's no patch?
Restricting which clients can reach the Candlepin port limits who can attempt the call. This does not stop a client that already holds a valid consumer certificate.Source: access.redhat.com, bugzilla.redhat.com