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CVE-2026-22797 is a privilege-escalation and impersonation vulnerability in OpenStack keystonemiddleware's external_oauth2_token middleware. In affected versions, the middleware does not sanitize or remove incoming authentication/identity headers before processing OAuth 2.0 tokens. As a result, attacker-supplied headers such as X-Is-Admin-Project, X-Roles, and X-User-Id can remain present and influence downstream authorization and identity handling. The issue exists because the middleware only conditionally set certain headers, which could leave forged values intact when the expected conditions were not met. OpenStack's fix adds a call to remove_auth_headers() at the start of request processing so externally supplied identity headers are stripped before token-derived identity is established. Affected versions are keystonemiddleware 10.5 through 10.7 before 10.7.2, 10.8 and 10.9 before 10.9.1, and 10.10 through 10.12 before 10.12.1.
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Cross-references every affected SKU, including bundled OEM variants.
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