CVE-2026-42875

MEDIUM

External Secrets Operator: Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore

Title source: cna
STIX 2.1

Description

External Secrets Operator reads information from a third-party service and automatically injects the values as Kubernetes Secrets. Prior to 2.4.0, Namespaced SecretStore resources that used CAProvider with type ConfigMap could resolve CA material from another namespace when caProvider.namespace was set. This bypassed the namespace boundary enforced for SecretStore-backed references in providers that rely on the shared runtime CA resolver. This vulnerability is fixed in 2.4.0.

References (1)

Core 1

Scores

CVSS v4 5.3
EPSS 0.0024
EPSS Percentile 14.9%
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-285 CWE-668
Status published
Products (2)
external-secrets/external-secrets 0 - 2.4.0Go
external-secrets/external-secrets < 2.4.0
Published May 11, 2026
Tracked Since May 12, 2026