CVE-2026-93539: CWE-306 Missing authentication for critical function in SUSE Rancher
A vulnerability was discovered in Fleet's Git webhook receiver (the gitjob webhook service). When a webhook secret is not configured, incoming webhook requests are accepted without verification, and processing a request can change the spec.pollingInterval field of a matching GitRepo resource in any namespace. A caller with network access to the webhook service and no Kubernetes credentials can therefore alter GitRepo configuration outside the namespaces they are authorized for. This only affects SUSE Rancher Fleet 0.16 before 0.16.2, older versions are not affected.
AI Analysis
Technical Summary
The vulnerability arises from missing authentication in Fleet's Git webhook receiver component. Without a configured webhook secret, incoming webhook requests are not verified, enabling unauthorized modification of the spec.pollingInterval field in GitRepo resources in any namespace. This flaw affects SUSE Rancher Fleet versions >=0.16.0 and <0.16.2. The issue is tracked as CWE-306 (Missing Authentication for Critical Function).
Potential Impact
An attacker with network access to the webhook service but no Kubernetes credentials can alter the configuration of GitRepo resources outside their authorized namespaces. This leads to integrity and availability impacts, as indicated by the CVSS vector (no confidentiality impact, but low integrity and low availability impact).
Mitigation Recommendations
Upgrade to SUSE Rancher Fleet version 0.16.2 or later where this vulnerability is fixed. Since the vulnerability is due to missing webhook secret configuration, ensuring that a webhook secret is configured also mitigates the issue. No other vendor advisory information is provided, so check SUSE's official advisories for further guidance.
CVE-2026-93539: CWE-306 Missing authentication for critical function in SUSE Rancher
Description
A vulnerability was discovered in Fleet's Git webhook receiver (the gitjob webhook service). When a webhook secret is not configured, incoming webhook requests are accepted without verification, and processing a request can change the spec.pollingInterval field of a matching GitRepo resource in any namespace. A caller with network access to the webhook service and no Kubernetes credentials can therefore alter GitRepo configuration outside the namespaces they are authorized for. This only affects SUSE Rancher Fleet 0.16 before 0.16.2, older versions are not affected.
CVSS v3.1
Score 5.4medium
Affected software
SUSE
Rancher
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability arises from missing authentication in Fleet's Git webhook receiver component. Without a configured webhook secret, incoming webhook requests are not verified, enabling unauthorized modification of the spec.pollingInterval field in GitRepo resources in any namespace. This flaw affects SUSE Rancher Fleet versions >=0.16.0 and <0.16.2. The issue is tracked as CWE-306 (Missing Authentication for Critical Function).
Potential Impact
An attacker with network access to the webhook service but no Kubernetes credentials can alter the configuration of GitRepo resources outside their authorized namespaces. This leads to integrity and availability impacts, as indicated by the CVSS vector (no confidentiality impact, but low integrity and low availability impact).
Mitigation Recommendations
Upgrade to SUSE Rancher Fleet version 0.16.2 or later where this vulnerability is fixed. Since the vulnerability is due to missing webhook secret configuration, ensuring that a webhook secret is configured also mitigates the issue. No other vendor advisory information is provided, so check SUSE's official advisories for further guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- suse
- Date Reserved
- 2026-09-18T09:08:10.294Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aba7aabf7a7c54106cb9e88
Added to database: 09/28/2026, 14:33:15 UTC
Last enriched: 09/28/2026, 14:47:58 UTC
Last updated: 09/29/2026, 01:57:22 UTC
Views: 13
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