# CVE-2026-122316: Kyverno 1.17.0 before 1.19.2 Cross-Namespace Write via NamespacedMutatingPolicy mutateExisting

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

Kyverno from 1.17.0 before 1.19.2 contains a missing authorization vulnerability in the mutate-existing background processor that allows namespaced tenants to modify resources outside their namespace. Attackers can create a NamespacedMutatingPolicy targeting Namespace objects or victim-namespace resources via CEL expressions, making the background-controller ServiceAccount strip Pod Security labels cluster-wide.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- kyverno / kyverno (github.com/kyverno/kyverno): ≥ 1.17.0; < 1.19.2 (affected, semver); 1.19.2 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.4 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.5 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/kyverno/kyverno/security/advisories/GHSA-vm98-8c25-h274 (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/kyverno-1.17.0-before-1.19.2-cross-namespace-write-via-namespacedmutatingpolicy-mutateexisting (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-122316; retrieved 2026-11-05; source updated 2026-11-05

Revision: 37d0c3809c37e961ac5a411784aa2f2c20a3f4d9c0b33fa30dcfcad8cf5c6828

Canonical: https://y2.dev/cve/CVE-2026-122316

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