8.8

CVE-2026-42998: openstack keystone Incorrect Authorization

Analyzed
AliasesGHSA-8f8m-wrvr-wcvfPYSEC-2026-599UBUNTU-CVE-2026-42998
Published 28-05-2026Last modified 28-05-2026

Vulnerability summary

CVE-2026-42998 is a high (CVSS 8.8) Incorrect Authorization vulnerability in openstack keystone. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 23.2% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 6, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
0.30%
0%100%
Low · -0.10 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
CGA-WMWR-29MF-6427USN-8433-1

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 28-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

Decrease -0.10 pp

From 0.40% on 05-10-2026

05-10-202604-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugs.launchpad.net)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard6 products
  • openstack-keystone-2025.1< 27.0.1_git20260618-r6
  • openstack-keystone-2025.1-fips< 27.0.1_git20260618-r7
  • openstack-keystone-2025.2< 28.0.1_git20260618-r5
  • openstack-keystone-2025.2-fips< 28.0.1_git20260618-r5
  • openstack-keystone-2026.1< 29.0.1_git20260616-r6
Debian1 product
  • keystone< 2:22.0.2-0+deb12u3 | < 2:27.0.0-3+deb13u4 | < 2:29.0.1-2
Openstack1 product
  • keystone≥ 14.0.0, < 27.0.2 | ≥ 28.0.0, < 28.0.2 | ≥ 29.0.0, < 29.0.2
PyPI1 product
  • keystone≥ 14.0.0, < 27.0.2 | ≥ 28.0.0, < 28.0.2 | ≥ 29.0.0, < 29.0.2
Ubuntu1 product
  • keystoneAll versions (No fix recorded) | < 2:21.0.1-0ubuntu2.4 | < 2:25.0.0-0ubuntu1.4 | < 2:28.0.0-0ubuntu1.3 | < 2:29.0.0-0ubuntu1.2

5 vendors · 10 products

References

11 links
Show all 11 references