Improper Token Revocation via OAuth2 Scope Enforcement in Multiple WSO2 Products [Disrupted Authentication Flows]

When the `allowed_scopes` configuration is enabled, the OAuth2 token introspection mechanism does not immediately invalidate a token in the cache after a revocation request. This results in a scenario where an access token that was introspected immediately before a revocation request may be returned again to the client after revocation, until the relevant cache entry is cleared. The security consequence is that a revoked access token may be re-issued to the client during the cache lifetime. While the re-issued token is not treated as valid for API authorization, affected users may be unable to obtain a new valid access token until the cache is cleared, which can disrupt authentication flows.

Source published

28 Oct 2026 19:21:34 UTC

Source modified

29 Oct 2026 02:02:14 UTC

Observed here

29 Oct 2026 03:48:01 UTC

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CVSS 3.1 · 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L