---
cve: "CVE-2026-43001"
severity: "HIGH"
cvss: 7.9
epss: "47%"
vendor: "OpenStack"
kev: false
exploited: false
published: "2026-05-01 09:16:17"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T22:22:45+02:00"
---

# CVE-2026-43001

> 7.9 HIGH

## Beschreibung

An issue was discovered in OpenStack Keystone before 29.0.2. POST /v3/credentials did not validate that the caller-supplied project_id for an EC2-type credential matched the project of the authenticating application credential. This allowed an attacker holding an unrestricted application credential for project A to create an EC2 credential targeting project B; a subsequent /v3/ec2tokens exchange would then issue a Keystone token scoped to project B while still carrying the original app_cred_id, enabling cross-project lateral movement within the credential owner's role footprint.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- b896b71557ce8370c442fe05818a74d7a9a623a8 (Commit)
- 3dfbbe7b9bd11dcd64420da0e4eda48b637f4a70 (Commit)

## Referenzen

- <https://bugs.launchpad.net/keystone/+bug/2149775>
- <https://review.opendev.org/c/openstack/keystone/+/985804>
- <https://security.openstack.org/ossa/OSSA-2026-015.html>
- <https://access.redhat.com/errata/RHSA-2026:39808>
- <https://access.redhat.com/errata/RHSA-2026:54757>
- <https://access.redhat.com/security/cve/CVE-2026-43001>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2464305>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43001.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-43001) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_