An issue was discovered in OpenStack 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. 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. All deployments using the external_oauth2_token middleware are affected.

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-22797
• https://launchpad.net/bugs/2129018
• https://www.openwall.com/lists/oss-security/2026/01/16/9
• http://www.openwall.com/lists/oss-security/2026/01/15/1
• http://www.openwall.com/lists/oss-security/2026/01/16/2
• http://www.openwall.com/lists/oss-security/2026/01/16/3
• http://www.openwall.com/lists/oss-security/2026/01/16/9