CVE-2026-55670: ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers

June 18, 2026

A flaw in the user lifecycle enforcement allowed deleted users to retain their original organization/tenant association. Recreating a deleted user under a distinct organization can cause the new user instance to be incorrectly provisioned within the original organization if the previous ID would be used to recreate it.

References

github.com/advisories/GHSA-6x8v-2fq5-2229
github.com/zitadel/zitadel/commit/6082e59d47c17a9d54a6b0556b3f31559d7c620a
github.com/zitadel/zitadel/releases/tag/v4.15.2
github.com/zitadel/zitadel/security/advisories/GHSA-6x8v-2fq5-2229
nvd.nist.gov/vuln/detail/CVE-2026-55670

Code Behaviors & Features

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