{"id":"CVE-2026-55670","aliases":["GHSA-6x8v-2fq5-2229","GO-2026-5197"],"url":"https://o3.security/vulnerability/CVE-2026-55670","summary":"ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers","details":"ZITADEL is an open source identity management platform. Prior to 4.15.1, ZITADEL's event store validation can retain the original resource owner for a deleted user identifier, causing a later user recreated with the same identifier in another organization to be provisioned under the original organization and exposed to that organization's administrator. This issue is fixed in version 4.15.2.","published":"2026-07-10T17:15:44.783Z","modified":"2026-08-12T03:51:39.365676995Z","cvss":null,"epss":{"score":0.00362,"percentile":0.2927,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","fixedVersion":"1.80.0-v2.20.0.20260615092437-6082e59d47c1"}],"fix":{"url":"https://github.com/zitadel/zitadel/commit/a939b847d90c3370bd162064e57764b89c01be46","label":"zitadel/zitadel@a939b84"},"references":[{"type":"WEB","url":"https://github.com/zitadel/zitadel/releases/tag/v4.15.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55670.json"},{"type":"ADVISORY","url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-6x8v-2fq5-2229"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55670"},{"type":"FIX","url":"https://github.com/zitadel/zitadel/commit/a939b847d90c3370bd162064e57764b89c01be46"},{"type":"FIX","url":"https://github.com/zitadel/zitadel/pull/12261"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:39.365676995Z"}}