What is CVE-2026-42876?

CVE-2026-42876 is a medium-severity vulnerability in External-secrets, classified under Improper Authorization. CVSS score: 4.9/10. Published 2026-05-11.

How severe is CVE-2026-42876?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Auth bypass in External-secrets

CVE-2026-42876

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…

EPSS: 0.000 (0.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

External-secrets — versions < 2.4.1

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-42876?: CVE-2026-42876 is a medium-severity vulnerability in External-secrets, classified under Improper Authorization. CVSS score: 4.9/10. Published 2026-05-11.
How severe is CVE-2026-42876?: Medium severity. CVSS v3 base score is 4.9 out of 10.