CVE-2026-43000
Description
A flaw was found in OpenStack Keystone. An attacker with a member role on a project can escalate their privileges to an administrator role. This is achieved by combining an application credential impersonation vulnerability with the misuse of Keystone trusts. The system incorrectly validates delegated roles against the victim's actual database roles instead of the requesting token, allowing the attacker to create a trust that grants them the victim's administrative privileges. This trust can then be used to maintain persistent access.
Statement
This IMPORTANT privilege escalation in Keystone allows project members to gain admin access by chaining application credential impersonation with trust exploitation. High complexity is required (multiple vulnerability chain). The scope is changed as the attacker gains persistent admin access affecting other users. Impact is high to confidentiality and integrity. Affects versions before 29.0.2.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.4 | 8.8 | 8.4 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | Low | High |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Changed | Unchanged | Changed |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | Low | High | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Understanding the Weakness (CWE)
Access Control
Technical Impact: Gain Privileges or Assume Identity
A user can access restricted functionality and/or sensitive information that may include administrative functionality and user accounts.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
