Grafana Alloy up to 1.18.1 prometheus.operator.servicemonitors bearerTokenFile information disclosure

Summaryinfo

A vulnerability has been found in Grafana Alloy up to 1.18.1 and classified as problematic. Impacted is an unknown function of the component prometheus.operator.servicemonitors. Performing a manipulation of the argument bearerTokenFile results in information disclosure. This vulnerability is reported as CVE-2026-75889. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Grafana Alloy up to 1.18.1. It has been classified as problematic. This affects an unknown part of the component prometheus.operator.servicemonitors. The manipulation of the argument bearerTokenFile with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

Grafana Alloy’s prometheus.operator.servicemonitors component allows a user who can create or modify ServiceMonitor resources in a watched namespace to specify an arbitrary local file through bearerTokenFile. Alloy reads the file and sends its contents as a bearer token to an attacker-controlled scrape endpoint. This may disclose files accessible to the Alloy process, including its projected Kubernetes service account token, potentially granting the attacker Alloy’s Kubernetes permissions. Exploitation requires ServiceMonitor write access and lower privileges than Alloy’s service account.

The advisory is shared at grafana.com. This vulnerability is uniquely identified as CVE-2026-75889 since 08/18/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Grafana

Name

• Alloy

Version

• 1.18.0
• 1.18.1

License

• open-source

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

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• 🔒

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