CVE-2022-39388: Istio may allow identity impersonation if user has localhost access

Severity: low (CVSS 3.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-11-10 · updated 2026-06-17
Weakness: CWE-863

Description

Istio is an open platform to connect, manage, and secure microservices. In versions on the 1.15.x branch prior to 1.15.3, a user can impersonate any workload identity within the service mesh if they have localhost access to the Istiod control plane. Version 1.15.3 contains a patch for this issue. There are no known workarounds.

Affected products

istio: from 1.15.0 through 1.15.2

References

https://github.com/istio/istio/commit/346260e5115e9fbc65ba8a559bc686e6ca046a32
https://github.com/istio/istio/commit/9a643e270421560afb2630e00f76d46a55499df9
https://github.com/istio/istio/security/advisories/GHSA-6c6p-h79f-g6p4
https://istio.io/latest/news/releases/1.15.x/announcing-1.15.3/
https://github.com/istio/istio/commit/346260e5115e9fbc65ba8a559bc686e6ca046a32
https://github.com/istio/istio/commit/9a643e270421560afb2630e00f76d46a55499df9
https://github.com/istio/istio/security/advisories/GHSA-6c6p-h79f-g6p4
https://istio.io/latest/news/releases/1.15.x/announcing-1.15.3/

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