CVE-2026-42876— External Secrets Operator: Priviledge escalation with secret overwriting
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| external-secrets | external-secrets | < 2.4.1 | affected |
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I. Basic Information for CVE-2026-42876
Vulnerability Information
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Vulnerability Title
External Secrets Operator: Priviledge escalation with secret overwriting
Source: NVD (National Vulnerability Database)
Vulnerability Description
External Secrets Operator reads information from a third-party service and automatically injects the values as Kubernetes Secrets. Prior to 2.4.1, a user who only has permission to create ExternalSecret resources can cause the operator to create a Secret that Kubernetes will automatically populate with a long-lived token for the specified service account. This effectively allows the user to impersonate any service account in the namespace without needing direct create permissions on TokenRequest or Secrets of that type. This vulnerability is fixed in 2.4.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
External Secrets 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
External Secrets是External Secrets开源的一个 Kubernetes 相关应用程序。 External Secrets Operator 2.4.1之前版本存在授权问题漏洞，该漏洞源于用户可创建ExternalSecret资源，导致操作员创建包含长期令牌的Secret，从而模拟任何服务账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| external-secrets | external-secrets | < 2.4.1 | - |
II. Public POCs for CVE-2026-42876
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: external-secrets
- CVE-2026-42875
External Secrets Operator: Namespace Isolation Bypass in CAP - CVE-2026-34984
External Secrets Operator has DNS exfiltration via getHostBy - CVE-2026-22822
External Secrets Operator insecurely retrieves secrets throu - CVE-2025-62159
External Secrets Operator's BeyondTrust Provider has Insecur - CVE-2025-55196
External Secrets Operator Missing Namespace Restriction in P
Same vendor: external-secrets
- CVE-2026-42875
External Secrets Operator: Namespace Isolation Bypass in CAP - CVE-2026-34984
External Secrets Operator has DNS exfiltration via getHostBy - CVE-2026-22822
External Secrets Operator insecurely retrieves secrets throu - CVE-2025-62159
External Secrets Operator's BeyondTrust Provider has Insecur - CVE-2025-55196
External Secrets Operator Missing Namespace Restriction in P
Same weakness: CWE-285
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