Is CVE-2026-42998 actively exploited?

No active exploitation of CVE-2026-42998 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42998 be exploited remotely?

Yes. CVE-2026-42998 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42998?

CVE-2026-42998 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2026-42998

CWE-863Published: May 28, 2026· Updated: Jun 2, 2026

8.8

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:18.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42998 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.