VulnerabilityPublished 12 Aug 2026Updated 5 Sep 2026

CVE-2026-64927: Red Hat Advanced Cluster Management for Kubernetes 2.11 · Insecure Direct Object Reference

Affects Red Hat Advanced Cluster Management for Kubernetes 2.11Source CVE Database V5

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Not known to be exploited · CVSS 6.4 Medium.

Data as of 9 Nov 2026, 23:24 UTC

CVSS 3.1 base score

6.4Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 26% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 12 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.11	Affected–	Fixed in–
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.13	Affected–	Fixed in–
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.14	Affected–	Fixed in–
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.15	Affected–	Fixed in–
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.16	Affected–	Fixed in–
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.17	Affected–	Fixed in–

AI-suggested

Red Hat advises restricting the creation of Channel resources to trusted administrators only within Red Hat Advanced Cluster Management. This limits the attack surface and prevents unauthorized tenants from exploiting the confused deputy vulnerability. Users should monitor the Red Hat advisory for updates on patch availability.

Description

A flaw was found in the multicloud-operators-channel component. This vulnerability allows a user with specific permissions to manipulate how the system handles sensitive information, known as Secrets, across different parts of the system (namespaces). By exploiting this, an attacker can modify these Secrets in unauthorized areas. This could lead to unauthorized access to information or elevated privileges within the system.

Impact

An attacker with Channel create permissions can modify Secrets in arbitrary namespaces, potentially gaining unauthorized access to sensitive information or escalating privileges within the Kubernetes cluster. This could compromise confidentiality and integrity of cluster secrets but does not affect availability. The vulnerability enables horizontal and vertical privilege escalation within the cluster environment.

Summary

This vulnerability (CVE-2026-64927) affects the multicloud-operators-channel component of Red Hat Advanced Cluster Management for Kubernetes 2. It is an authorization bypass (CWE-639) where a tenant with Channel create permissions can manipulate how Secrets are handled across namespaces, allowing cross-namespace Secret and ConfigMap mutation. This confused deputy flaw results in privilege escalation within the cluster by expanding backup scope and enabling unauthorized Secret modifications. The CVSS v3.1 base score is 6.4 (medium severity) with network attack vector, low complexity, low privileges required, no user interaction, and scope change. Red Hat’s advisory recommends restricting Channel resource creation to trusted administrators as a mitigation.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Aug 2026, 02:14 UTC

Technical details

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