WSO2 Identity Server Implicit-Association Resolver improper authentication

Summaryinfo

A vulnerability has been found in WSO2 Identity Server and classified as critical. Affected by this vulnerability is an unknown functionality of the component Implicit-Association Resolver. Performing a manipulation results in improper authentication. This vulnerability is cataloged as CVE-2025-11850. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in WSO2 Identity Server (the affected version unknown). It has been classified as critical. This affects an unknown part of the component Implicit-Association Resolver. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

When secondary user stores are configured, the implicit-association resolver incorrectly initializes from a secondary user store and bypasses the primary user store during search and uniqueness checks. This allows a subject to be associated with an unintended local account if the same lookup claim (e.g., username or email) exists in both the primary and a secondary store. If duplicate claim values exist across user stores, this issue can lead to identity confusion due to incorrect implicit associations when using an external Identity Provider (IDP). Legitimate user accounts in the primary user store may fail to associate correctly with their corresponding external IDP accounts, potentially restricting access if the secondary account has fewer privileges. Deployments are not affected if no secondary user stores are configured, implicit association is disabled, or claim values are globally unique.

The advisory is shared at security.docs.wso2.com. This vulnerability is uniquely identified as CVE-2025-11850 since 10/16/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/06/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• WSO2

Name

• Identity Server

License

• commercial

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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