Zitadel up to 4.16.2 User Service API improper authorization

Summaryinfo

A vulnerability, which was classified as problematic, was found in Zitadel. Affected by this issue is some unknown functionality of the component User Service API. The manipulation results in improper authorization. This vulnerability is identified as CVE-2026-105206. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Zitadel. Affected is some unknown functionality of the component User Service API. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. CVE summarizes:

ZITADEL 3.0.0 through 3.4.15 and 4.x before 4.17.3 contains an incorrect authorization flaw in the User Service API, which verifies user.read against the caller's organization rather than the organization owning the target user. An authenticated member holding org-scoped user.read can query GET /v2/users/{userId}/authentication_methods to learn which authentication method types users in other organizations have registered.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-105206 since 10/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 4.17.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-92099). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Zitadel

Version

• 1.80.0-v2.20.0.20260317120401-d90285929ca0
• 1.87.1
• 2.2.0
• 2.37.3
• 2.38.0
• 2.38.2
• 2.38.3
• 2.39.1
• 2.39.2
• 2.39.9
• 2.40.4
• 2.40.9
• 2.40.10
• 2.41.5
• 2.41.6
• 2.41.15
• 2.42.14
• 2.42.15
• 2.42.17
• 2.43.8
• 2.43.10
• 2.43.11
• 2.43.92.46.1
• 2.44.2
• 2.44.3
• 2.44.6
• 2.44.7
• 2.45.0
• 2.45.1
• 2.45.4
• 2.45.5
• 2.45.7
• 2.46.0
• 2.46.1
• 2.46.4
• 2.46.5
• 2.46.6
• 2.46.7
• 2.47.3
• 2.47.7
• 2.47.8
• 2.47.9
• 2.47.10
• 2.48.2
• 2.48.3
• 2.48.4
• 2.48.5
• 2.49.4
• 2.49.5
• 2.50.2
• 2.50.3
• 2.52.3
• 2.53.8
• 2.53.9
• 2.54.5
• 2.54.7
• 2.54.8
• 2.54.10
• 2.55.1
• 2.55.4
• 2.55.5
• 2.55.7
• 2.55.8
• 2.56.1
• 2.56.2
• 2.56.5
• 2.56.6
• 2.57.0
• 2.57.1
• 2.57.4
• 2.57.5
• 2.58.0
• 2.58.1
• 2.58.4
• 2.58.5
• 2.58.6
• 2.58.7
• 2.59.2
• 2.59.3
• 2.59.4
• 2.59.5
• 2.60.1
• 2.60.2
• 2.60.3
• 2.60.4
• 2.61.0
• 2.61.1
• 2.61.2
• 2.61.3
• 2.61.4
• 2.62.0
• 2.62.1
• 2.62.6
• 2.62.7
• 2.62.8
• 2.63.4
• 2.63.5
• 2.63.6
• 2.63.8
• 2.63.9
• 2.64.0
• 2.64.1
• 2.64.4
• 2.64.5
• 2.64.6
• 2.65.5
• 2.65.6
• 2.65.7
• 2.66.10
• 2.66.11
• 2.66.15
• 2.66.16
• 2.67.7
• 2.67.8
• 2.67.12
• 2.67.13
• 2.68.3
• 2.68.4
• 2.68.8
• 2.68.9
• 2.69.3
• 2.69.4
• 2.69.8
• 2.69.9
• 2.70.0
• 2.70.1
• 2.70.7
• 2.70.8
• 2.70.10
• 2.70.12
• 2.70.14
• 2.71.5
• 2.71.6
• 2.71.8
• 2.71.9
• 2.71.10
• 2.71.12
• 2.71.13
• 2.71.15
• 2.71.17
• 2.71.18
• 2.71.19
• 3.0.0
• 3.2.1
• 3.2.2
• 3.3
• 3.3.0
• 3.3.1
• 3.4.0
• 3.4.2
• 3.4.3
• 3.4.4
• 3.4.5
• 3.4.6
• 3.4.7
• 3.4.8
• 3.4.9
• 3.4.10
• 3.4.11
• 3.4.12
• 3.4.13
• 3.4.14
• 4.0.0-rc.1
• 4.0.2
• 4.0.3
• 4.5
• 4.6.0
• 4.6.3
• 4.6.5
• 4.6.6
• 4.7.1
• 4.7.2
• 4.9.0
• 4.9.1
• 4.10
• 4.11.0
• 4.11.1
• 4.12.0
• 4.12.1
• 4.12.2
• 4.12.3
• 4.14
• 4.15.0
• 4.15.1
• 4.15.2
• 4.15.3
• 4.16.0
• 4.16.1
• 4.16.2

Website

• Product: https://github.com/zitadel/zitadel/

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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