Advisory details:
pypa / keystone/PYSEC-2026-599
| Advisory ID | pypa/keystone/PYSEC-2026-599 |
| Aliases |
CVE-2026-42998
GHSA-8f8m-wrvr-wcvf PYSEC-2026-599 |
| Summary | 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 7.9 |
| Risk | 4.0 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 8.8 | https://github.com/pypa/advisory-database/blob/main/vulns/keystone/PYSEC-2026-599.yaml |
| Reference id | Reference type | URL |
|---|---|---|
| https://security.openstack.org/ossa/OSSA-2026-015.html | ||
| 2148477 | Other | https://bugs.launchpad.net/keystone/+bug/2148477 |
| GHSA-8f8m-wrvr-wcvf | https://github.com/advisories/GHSA-8f8m-wrvr-wcvf |
No exploits are available.
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-28T19:38:16Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/42xxx/CVE-2026-42998.json
Source Advisory: vulnrichment/CVE-2026-42998
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]