Vulnerability Description
An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openstack | Keystone | >= 14.0.0, < 27.0.2 |
Related Weaknesses (CWE)
References
- https://bugs.launchpad.net/keystone/+bug/2148477ExploitIssue TrackingPatch
- https://security.openstack.org/ossa/OSSA-2026-015.htmlPatchVendor Advisory
FAQ
What is CVE-2026-42998?
CVE-2026-42998 is a vulnerability with a CVSS score of 6.0 (MEDIUM). An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the ...
How severe is CVE-2026-42998?
CVE-2026-42998 has been rated MEDIUM with a CVSS base score of 6.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42998?
Check the references section above for vendor advisories and patch information. Affected products include: Openstack Keystone.