Multicluster Global Hub 1.4.9: Insufficient Verification of Data Authenticity
CVE-2026-71576 is a high-severity insufficient verification of data authenticity vulnerability in Multicluster Global Hub 1.4.9 from Red Hat, with a CVSS 3.1 base score of 8.5 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.29% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Multicluster Global Hub 1.4.9 you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Red Hat | Multicluster Global Hub 1.4.9 | Not specified in the record | Not stated |
| Red Hat | Multicluster Global Hub 1.5.8 | Not specified in the record | Not stated |
| Red Hat | Multicluster Global Hub 1.6.6 | Not specified in the record | Not stated |
| Red Hat | Multicluster Global Hub 1.7.3 | Not specified in the record | Not stated |
| Red Hat | Multicluster Global Hub 1.8.2 | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- LowPerformance or availability is reduced.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L. Scored by CNA (redhat.com).
Official description
A flaw was found in multicluster-global-hub. The manager component improperly validates the source identity of incoming CloudEvents on Kafka status topics. A remote attacker, after compromising a managed hub and obtaining its Kafka client certificate, can manipulate the self-asserted source identity. This allows the attacker to falsify or delete critical data, such as compliance, inventory, and cluster health information, belonging to other hubs in the database.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Insufficient Verification of Data Authenticity
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
More Insufficient Verification of Data Authenticity vulnerabilities (CWE-345)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
- access.redhat.com/errata/RHSA-2026:67516
- access.redhat.com/errata/RHSA-2026:67842
- access.redhat.com/errata/RHSA-2026:68515
- access.redhat.com/errata/RHSA-2026:71597
- access.redhat.com/errata/RHSA-2026:73038
- access.redhat.com/errata/RHSA-2026:73419
- access.redhat.com/security/cve/CVE-2026-71576
- bugzilla.redhat.com/show_bug.cgi?id=2512513
Other vulnerabilities in Multicluster Global Hub 1.4.9
- 9.9 Critical severity
Recent Insufficient Verification of Data Authenticity vulnerabilities
- 8.8 High severity
- 7.1 High severity
- 7.5 High severity
- 9.1 Critical severity
- 9.1 Critical severity
- 9.1 Critical severity
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