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The external_oauth2_token middleware fails to sanitize incoming authentication headers before processing OAuth 2.0 tokens. By sending forged identity headers such as X-Is-Admin-Project, X-Roles, or X-User-Id, an authenticated attacker may escalate privileges or impersonate other users. 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The external_oauth2_token middleware fails to properly sanitize incoming authentication headers. An authenticated attacker can exploit this by sending forged identity headers, such as X-Is-Admin-Project, X-Roles, or X-User-Id. 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