CVE-2026-43000 OpenStack Keystone has an Incorrect Authorization issue
Attackers with member role can escalate to admin by chaining application credentials and trusts, impersonating victims to bypass role validation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43000?
CVE-2026-43000 is a medium-severity vulnerability in OpenStack Keystone, published on 28 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim's identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim's actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim's admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim's identity.
Which versions are affected by CVE-2026-43000?
7 open source packages ship an affected version, including keystone. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
keystone PyPI | From 14.0.0 | 27.0.2, 28.0.2, 29.0.2 |
keystone PyPI | From 14.0.0 | 27.0.2 |
keystone PyPI | From 14.0.0 | 27.0.2 |
keystone PyPI | From 28.0.0 | 28.0.2 |
keystone PyPI | From 28.0.0 | 28.0.2 |
keystone PyPI | From 29.0.0 | 29.0.2 |
1 more packages
keystone PyPI | From 29.0.0 | 29.0.2 |
Products include Openstack Keystone.
How do I fix CVE-2026-43000?
Upgrade keystone to a fixed version for your release line: 27.0.2, 28.0.2 or 29.0.2.
Is CVE-2026-43000 being exploited?
There is no known exploitation of CVE-2026-43000 in the wild and no public exploit code.
Other vulnerabilities in OpenStack Keystone
- CVE-2020-12690 Insufficient Session Expiration in OpenStack Keystone
- CVE-2019-19687 OpenStack Keystone Credential Leakage
- CVE-2026-43001 OpenStack Keystone has an Incorrect Authorization Issue
- CVE-2014-2828 OpenStack Identity (Keystone) DoS through V3 API authentication chaining
- CVE-2021-38155 OpenStack Keystone allows information disclosure during account locking
Sources
Also known as DEBIAN-CVE-2026-43000, GHSA-q623-f4j4-p4xj, PYSEC-2026-601.