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CVE-2026-15573

Redhat Build Of Keycloak vulnerability

8.1 HIGHEPSS 0.46%
  1. Published5 Aug 2026

Description

A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs before comparison. By adding extra characters like a trailing slash or matrix parameters to a URL, an attacker can trick the system into applying a less restrictive security policy than intended. This allows an authenticated user to access administrative or restricted areas they should not have permission to see.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Redhat Build Of Keycloak≥ 26.4 < 26.4.14 · ≥ 26.6 < 26.6.5
Redhat Data Grid8.0
Redhat Jboss Enterprise Application Platform Expansion Packall versions
Redhat Single Sign-on7.0

Remediation

Fixed in
Redhat Build Of Keycloak≥ 26.4.14

References

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Frequently asked

Is CVE-2026-15573 being actively exploited?

CVE-2026-15573 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.46%.

How severe is CVE-2026-15573?

CVE-2026-15573 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.46% probability of exploitation.

Which products are affected by CVE-2026-15573?

Affected products include Redhat Build Of Keycloak, Redhat Data Grid, Redhat Jboss Enterprise Application Platform Expansion Pack, Redhat Single Sign-on.

How do I fix CVE-2026-15573?

Upgrade affected software to a fixed version, for example Redhat Build Of Keycloak 26.4.14 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-15573 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.