CVE-2026-44940 Overview
CVE-2026-44940 is an information disclosure vulnerability in the rancher-extension-stackstate extension used by SUSE Observability. The extension stores service tokens in plain configuration or insecure locations instead of protecting them with proper secrets management. An authenticated attacker with minimal access to the observability environment can read these tokens and reuse them to gain unauthorized access or escalate privileges. The weakness is classified under [CWE-200: Exposure of Sensitive Information to an Unauthorized Actor].
Critical Impact
Exposed service tokens allow low-privileged users to obtain credentials that grant broader access to the SUSE Observability environment.
Affected Products
- SUSE Observability
- rancher-extension-stackstate Rancher UI extension
- StackState integration components deployed through Rancher
Discovery Timeline
- 2026-09-17 - CVE-2026-44940 published to NVD
- 2026-09-17 - Last updated in NVD database
Technical Details for CVE-2026-44940
Vulnerability Analysis
The rancher-extension-stackstate extension connects Rancher-managed clusters to SUSE Observability using StackState service tokens. These tokens authenticate API calls made from the Rancher UI to the observability backend. The extension persists the tokens in configuration that is readable by users who should not have access to backend credentials. Any authenticated user who can reach the configuration surface can retrieve the token and impersonate the extension against the observability API.
The attack requires network access to the Rancher environment, valid low-privilege credentials, and some user interaction to trigger the flow that exposes the token. Confidentiality is directly impacted because the exposed material is a long-lived credential that unlocks additional data and functionality in SUSE Observability.
Root Cause
The root cause is insecure storage of a sensitive credential. The extension treats the StackState service token as ordinary configuration data rather than as a secret. It does not restrict read access to administrators, and it does not delegate storage to a secrets manager such as Kubernetes Secret objects with appropriate RBAC, an external vault, or Rancher's own secret handling primitives.
Attack Vector
An attacker authenticates to Rancher with a low-privilege account that can view the extension configuration. The attacker reads the exposed token from the configuration surface. With the token in hand, the attacker calls SUSE Observability APIs directly, bypassing Rancher-level access controls. Because the token is bound to the extension's service identity, the attacker inherits whatever permissions that identity holds in the observability backend, enabling privilege escalation within the observability plane.
No verified exploit code has been published. Refer to the GitHub Security Advisory GHSA-7c27-jc6w-pw95 and the SUSE Bug Report CVE-2026-44940 for technical details.
Detection Methods for CVE-2026-44940
Indicators of Compromise
- StackState API requests originating from IP addresses or user agents that do not match the Rancher extension's normal call pattern.
- Reads of extension configuration objects by user accounts that have no operational reason to access observability integration settings.
- Unexpected queries against SUSE Observability data from service token sessions outside standard maintenance windows.
Detection Strategies
- Audit Rancher and Kubernetes API server logs for get and list operations against configuration resources holding the rancher-extension-stackstate token.
- Correlate authentication events on the StackState API with the identity of the calling client and alert on tokens used from unexpected sources.
- Baseline normal extension traffic to SUSE Observability and flag deviations in request volume, endpoints, or timing.
Monitoring Recommendations
- Enable verbose audit logging on Rancher for extension configuration changes and reads.
- Forward Rancher, Kubernetes, and SUSE Observability logs to a centralized analytics platform for cross-source correlation.
- Review RBAC assignments periodically to confirm that only intended roles can access extension configuration namespaces.
How to Mitigate CVE-2026-44940
Immediate Actions Required
- Rotate every StackState service token used by the rancher-extension-stackstate extension and revoke previously issued tokens.
- Restrict access to the Rancher namespaces and resources where extension configuration is stored to administrative roles only.
- Review recent access to observability configuration and API traffic to identify any prior misuse of exposed tokens.
Patch Information
Consult the GitHub Security Advisory GHSA-7c27-jc6w-pw95 and the SUSE Bug Report CVE-2026-44940 for the fixed release of the rancher-extension-stackstate extension and upgrade guidance for SUSE Observability deployments.
Workarounds
- Store the service token in a properly scoped Kubernetes Secret with tight RBAC rather than in extension configuration accessible to non-administrators.
- Scope the StackState service token to the minimum permissions required by the integration to limit blast radius if it leaks.
- Restrict network reachability of the SUSE Observability API so that only the Rancher control plane can present the token.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.