Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

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

Low 2.3

In plain English

A low-severity improper access control in zitadel from zitadel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.3Low

Exploit odds (30 days)0.4%top 69.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/zitadel/zitadel	1.80.0-v2.20.0.20260615092437-6082e59d47c1	GO-2026-5197
Go	github.com/zitadel/zitadel	1.80.0-v2.20.0.20260615092437-6082e59d47c1	GHSA-6x8v-2fq5-2229

Affected products (as reported)

Vendor	Product	Versions
zitadel	zitadel	< 4.15.2

Weakness: CWE-284, CWE-639 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/zitadel/zitadel/security/advisories/GHSA-6x8v-2fq5-2229 x_refsource_CONFIRM
https://github.com/zitadel/zitadel/pull/12261 x_refsource_MISC
https://github.com/zitadel/zitadel/commit/a939b847d90c3370bd162064e57764b89c01be46 x_refsource_MISC
https://github.com/zitadel/zitadel/releases/tag/v4.15.2 x_refsource_MISC