CVE-2026-43001

Medium

Elevated severity or exploit probability.

CVSS base

7.9 HIGH

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

EPSS — probability of exploitation (30 days)

0.5%

39.6th percentile

CISA KEV

Not listed

Weakness / dates

CWE-1288

Published 2026-05-01 · modified 2026-08-14

CVSS breakdown

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

Attack Vector	N	Network
Attack Complexity	H	High
Privileges Required	H	High
User Interaction	N	None
Scope	C	Changed
Confidentiality	H	High
Integrity	H	High
Availability	L	Low

Timeline

2026-05-01 — Published (NVD)
2026-08-14 — Last modified (NVD)

Description

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.

Affected

openstack

References

Official: NVD · CVE.org