ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers
Priority LOW 12CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00362 30th percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.15.2github.com/zitadel/zitadel (Go): 1.80.0-v2.20.0.20260615092437-6082e59d47c1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| zitadel | zitadel | before 4.15.2 | 4.15.2 | Patch available | CNA |
| — | github.com/zitadel/zitadel (Go) | before 1.80.0-v2.20.0.20260615092437-6082e59d47c1 | 1.80.0-v2.20.0.20260615092437-6082e59d47c1 | Patch available | GHSA-6x8v-2fq5-2229 |
- zitadel Vendorzitadel Affected before 4.15.2 Fixed in 4.15.2 Patch available CNA
- github.com/zitadel/zitadel (Go) Vendor— Affected before 1.80.0-v2.20.0.20260615092437-6082e59d47c1 Fixed in 1.80.0-v2.20.0.20260615092437-6082e59d47c1 Patch available GHSA-6x8v-2fq5-2229
Remediation
- Fix · CNA zitadel (zitadel) Fixed in 4.15.2
- Fix · GHSA-6x8v-2fq5-2229 github.com/zitadel/zitadel (Go) Fixed in 1.80.0-v2.20.0.20260615092437-6082e59d47c1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55670
- 2026-10-03 Alias added: GHSA-6x8v-2fq5-2229
References
Other 6
- https://github.com/zitadel/zitadel/security/advisories/GHSA-6x8v-2fq5-2229
- https://github.com/zitadel/zitadel/pull/12261
- https://github.com/zitadel/zitadel/commit/a939b847d90c3370bd162064e57764b89c01be46
- https://github.com/zitadel/zitadel/releases/tag/v4.15.2
- https://github.com/zitadel/zitadel/commit/6082e59d47c17a9d54a6b0556b3f31559d7c620a
- https://github.com/zitadel/zitadel
More zitadel vulnerabilities
- TI-2024-26607 ZITADEL Vulnerable to Session Information Leakage CVSS 3.1MEDIUM 6.5
- TI-2026-67551 ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback CVSS 4.0CRITICAL 9.3
- TI-2026-67543 ZITADEL before 4.17.3 Account Takeover via External IdP Linking CVSS 4.0CRITICAL 9.3
- TI-2025-41253 ZITADEL Vulnerable to Unauthenticated Full-Read SSRF via V2 Login CVSS 3.1CRITICAL 9.3
- TI-2025-39554 Zitadel Bypass Second Authentication Factor CVSS 4.0HIGH 8.7
- TI-2026-82647 ZITADEL Login V2 flaw lets attackers approve device authorizations CVSS 4.0HIGH 8.6
Sources
- CVE-2026-55670 · CVE Program
- CVE-2026-55670 · NVD
- FIRST EPSS
- GHSA-6x8v-2fq5-2229 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences