Executive Summary

CVE-2026-10609 is a security vulnerability in the OpenShift Cluster Logging Operator caused by a missing authorization check.

The operator creates and forwards ServiceAccount tokens to output destinations without verifying that the creator of the ClusterLogForwarder (CLF) has permission to use those tokens.

This flaw allows a user with write access to CLF resources, but without secrets access, to steal ServiceAccount tokens within the same namespace.

The vulnerability can be exploited more broadly when the CLF specifies only receiver-type inputs, bypassing certain authorization checks, which increases the scope of affected ServiceAccounts.

The stolen tokens inherit all RBAC permissions of the targeted ServiceAccount, enabling potential privilege escalation within the cluster.

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Impact Analysis

This vulnerability can lead to unauthorized access and privilege escalation within an OpenShift cluster.

An attacker with write access to ClusterLogForwarder resources can exfiltrate ServiceAccount tokens without proper authorization.

Using the stolen tokens, the attacker can assume the permissions of the targeted ServiceAccount, potentially gaining cluster-wide privileges.

This can result in unauthorized actions, data exposure, and compromise of the cluster's security.

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Detection Guidance

Detection of this vulnerability involves identifying unauthorized creation and forwarding of ServiceAccount tokens by the OpenShift Cluster Logging Operator without proper authorization checks.

Specifically, you should audit ClusterLogForwarder (CLF) resources to check if users with write access but without secrets access are creating or modifying CLF configurations.

You can also monitor network traffic for unexpected forwarding of ServiceAccount tokens to output destinations.

While no explicit commands are provided in the resources, typical commands to investigate might include:

• kubectl get clusterlogforwarders -A -o yaml # To review CLF configurations across namespaces
• kubectl auth can-i create clusterlogforwarders --as <user> -n <namespace> # To check user permissions
• kubectl get secrets -n <namespace> # To check for unexpected ServiceAccount tokens
• Network monitoring tools to detect token exfiltration attempts

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Mitigation Strategies

Immediate mitigation steps include restricting write access to ClusterLogForwarder resources only to users who also have permission to access the associated ServiceAccount tokens.

Ensure that RBAC policies are properly configured so that delegated editors cannot create or modify CLF resources without proper authorization.

Review and update the OpenShift Cluster Logging Operator to a version that includes a fix for this missing authorization flaw once available.

In the meantime, monitor for suspicious activity related to ServiceAccount token forwarding and consider limiting the use of receiver-type inputs in CLF configurations to reduce attack surface.

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Compliance Impact

This vulnerability allows unauthorized users to exfiltrate ServiceAccount tokens and escalate privileges within the OpenShift cluster. Such unauthorized access and privilege escalation can lead to exposure of sensitive data and unauthorized actions within the system.

While the provided information does not explicitly mention compliance with standards like GDPR or HIPAA, the ability to steal credentials and escalate privileges could potentially result in violations of these regulations, which require strict access controls and protection of sensitive data.

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