Medium · CVSS 6.8CVE-2026-19278

Stackrox: stackrox: privilege escalation via unanchored regular expressions in auth m2m role mappingsCVE-2026-19278

Answer in brief

CVE-2026-19278 records a Medium severity (CVSS 6.8) vulnerability in Stackrox: stackrox: privilege escalation via unanchored regular expressions in auth m2m role mappings. The current sources do not mark it as known exploited. The current feed maps Red Hat/advanced-cluster-security/rhacs-main-rhel8 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 10, 2026Updated Oct 23, 2026Source checked Nov 9, 2026First seen by HOL Aug 10, 2026Material review Oct 23, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/advanced-cluster-security/rhacs-main-rhel8 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/advanced-cluster-security/rhacs-main-rhel8generic	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/advanced-cluster-security/rhacs-main-rhel8.
Review the reported fix. Source-reported 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.

Evidence timeline and material changes

Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Package

Affected range

Fixed version

Red Hat/advanced-cluster-security/rhacs-main-rhel8generic

Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/advanced-cluster-security/rhacs-main-rhel8.

Review the reported fix. Source-reported 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.

Sources and claim methodology

Upstream source description

Quoted source text, attributed separately from HOL analysis.