Description

When internal roles are removed from a user within the WSO2 product, the system fails to invalidate any previously issued authentication tokens associated with that user. This vulnerability could allow users to retain their previous access privileges even after their roles have been revoked. As a result, a user can continue to perform unauthorized actions or access restricted resources until the expired tokens naturally expire.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.0",
  "pubDate": "2026-08-06T22:16:41.280Z",
  "pubdate": "2026-08-06T22:16:41.280Z",
  "executiveSummary": "This security assessment analyzes an authorization flaw within the WSO2 product where internal role revocations fail to invalidate previously issued authentication tokens.\nThe vulnerability type is session invalidation failure resulting in improper privilege management.\nThe primary impact is the persistence of access privileges after administrative role removal, allowing users to continue performing unauthorized actions and accessing restricted resources.\nThe affected systems include the WSO2 product instances where role modifications do not trigger downstream session or token termination.\nRisk implications involve extended unauthorized access windows, compliance violations, and potential lateral movement or data exposure until the affected tokens reach their natural expiration time.\nAttacker capabilities include the retention and reuse of legitimate authentication artifacts post-revocation, requiring no specialized cryptographic bypass techniques.\nExploitation requirements include prior possession of a valid authentication token issued before the internal role removal occurs.",
  "technicalDetails": "The root cause of the vulnerability stems from a decoupling between the authorization state management layer and the token validation mechanism within the WSO2 product.\nWhen internal user roles are modified or revoked, the changes update the user's current identity profile within the directory or authorization store, but this state change is not synchronously propagated to active authentication tokens or sessions.\nThe vulnerable component is the session and token validation subsystem, which relies solely on cryptographic signature verification or static token expiration checks rather than performing real-time authorization lookups or maintaining a centralized token blacklist/revocation list.\nThe attack flow proceeds as follows: First, an authenticated user obtains a valid authentication token while assigned to a privileged internal role. Second, an administrator revokes the internal role from the user within the WSO2 product. Third, the user initiates requests to restricted resources using the pre-existing authentication token. Fourth, the token validation component verifies the structural integrity and expiration timestamp of the token without querying the current role assignments of the user. Fifth, the system incorrectly accepts the token, permitting the user to execute unauthorized actions and access restricted resources.\nAuthentication requirements involve the attacker presenting a previously issued, cryptographically valid authentication token.\nPrivilege requirements are asymmetric; the attacker benefits from previously held privileges that have been administratively revoked.\nNetwork exposure encompasses any interface accepting the affected authentication tokens for resource access.\nPayload behavior involves standard API requests or resource queries accompanied by the stale token.\nPost-exploitation impact includes unauthorized data retrieval, execution of administrative functions, and prolonged resource access until token expiration."
}