Server-Side Request Forgery in KubeSphere Git Credential Verification Endpoint
CVE-2026-91923

8.3HIGH

Key Information:

Vendor

Kubesphere

Status
Kubesphere
Vendor
CVE Published:
15 September 2026

What is CVE-2026-91923?

KubeSphere, up to version 4.1.3, presents a server-side request forgery vulnerability in its git credential verification endpoint. This flaw allows authenticated users to exploit unvalidated caller-supplied URLs without any allowlist restrictions. By leveraging error responses from the endpoint, attackers can craft arbitrary URLs that reach internal services and potentially exfiltrate sensitive basic-auth credentials from Secrets across various namespaces. This risk emphasizes the importance of implementing strict validation protocols to safeguard exposure of internal resources.

Affected Version(s)

kubesphere 0 <= 4.1.3

References

https://github.com/kubesphere/kubesphere/issues/6653
issue-tracking
https://github.com/kubesphere/kubesphere
product
https://github.com/kubesphere/kubesphere/blob/3ef3a6bc98b...
technical-description

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.