Description
A flaw was found in StackRox/RHACS Central's Auth Machine-to-Machine (M2M) token exchange. When an administrator configures M2M role mappings, the system uses unanchored regular expressions for matching claim values. This allows an attacker with a valid OpenID Connect (OIDC) token, whose claim value is a superstring of a configured pattern, to gain unauthorized access to roles they were not intended to receive. This can lead to privilege escalation within the system.
Published: 2026-08-10
Score: 6.8 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Administrators should review and update their Auth Machine-to-Machine (M2M) role mappings in StackRox/RHACS Central to ensure that `valueExpression` regular expressions are properly anchored (e.g., by adding `^` and `$` delimiters). This ensures exact matching of claim values and prevents unintended role assignments. Reloading the configuration or restarting the Central service may be required for changes to take effect.

Tracking

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Advisories

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History

Tue, 11 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 10 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 10 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in StackRox/RHACS Central's Auth Machine-to-Machine (M2M) token exchange. When an administrator configures M2M role mappings, the system uses unanchored regular expressions for matching claim values. This allows an attacker with a valid OpenID Connect (OIDC) token, whose claim value is a superstring of a configured pattern, to gain unauthorized access to roles they were not intended to receive. This can lead to privilege escalation within the system.
Title Stackrox: stackrox: privilege escalation via unanchored regular expressions in auth m2m role mappings
First Time appeared Redhat
Redhat advanced Cluster Security
Weaknesses CWE-625
CPEs cpe:/a:redhat:advanced_cluster_security:4
Vendors & Products Redhat
Redhat advanced Cluster Security
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N'}


Subscriptions

Redhat Advanced Cluster Security
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-10T18:09:21.966Z

Reserved: 2026-08-07T15:16:51.217Z

Link: CVE-2026-19278

cve-icon Vulnrichment

Updated: 2026-08-10T18:09:13.914Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-07T09:41:42Z

Links: CVE-2026-19278 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-10T13:30:05Z

Weaknesses