ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers (CVE-2026-55670) | HOL Guard CVE

Low · CVSS 2.3CVE-2026-55670GHSA-6X8V-2FQ5-2229

ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers

Answer in brief

CVE-2026-55670 records a Low severity (CVSS 2.3) vulnerability in ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers. The current sources do not mark it as known exploited. The current feed maps zitadel/zitadel (generic), github.com/zitadel/zitadel (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 10, 2026Updated Jul 10, 2026Source checked Sep 17, 2026First seen by HOL Jun 19, 2026Material review Jul 10, 2026

Upstream Advisory

Key facts

Risk: Low · CVSS 2.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 2.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps zitadel/zitadel (generic), github.com/zitadel/zitadel (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
zitadel/zitadelgeneric	< 4.15.2	Not reported
github.com/zitadel/zitadelgo	<1.80.0-v2.20.0.20260615092437-6082e59d47c1	1.80.0-v2.20.0.20260615092437-6082e59d47c1

Recommended response

Check inventory. Check lockfiles and deployed manifests for zitadel/zitadel, github.com/zitadel/zitadel.
Review the reported fix. Update github.com/zitadel/zitadel to 1.80.0-v2.20.0.20260615092437-6082e59d47c1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 19, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.