No exploitation reported

CVE-2026-18573

No exploitation reported by the sources we read.

Published2026-08-02

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A flaw was found in the keycloak-services component of Keycloak, which is used for managing authentication and authorization flows. The issue occurs when a realm administrator configures client policies to enforce specific authentication requirements on confidential clients. Due to improper evaluation of the client state during an update operation, an attacker with client management permissions can bypass these security policies by first creating a public client and then updating it to a confidential client with weaker authentication. This can result in the persistence of clients that do not comply with the intended security hardening of the realm.

Timeline

dates in UTC

2026-08-0206:16CVE publishedNVD

Versions per branch

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

keycloakBitnamiall versions · fixed in 26.7.3

Vendor advisories

CVE-2026-18573 Red Hat Product Security10 products fixed
keycloak-services: keycloak-services: Client access-type policy condition bypass during client update
RHSA-2026:68277 Red Hat Product Security9 products fixed
Red Hat Security Advisory: Red Hat build of Keycloak 26.6.7 Images Security Update
RHSA-2026:68278 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat build of Keycloak 26.6.7 Security Update

Full record on NVD

Fix

Vendor fix Red Hat Product Security RHSA-2026:68277 · 9 productsBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.
Workaround from the vendor Red Hat Product Security RHSA-2026:68277 · 9 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE record2026-08-02
FIRST EPSSEPSS score0.5 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Published: 2026-08-02
Last Modified: 2026-08-02

Frequently asked questions

What is CVE-2026-18573?

Is CVE-2026-18573 actively exploited?

Active exploitation of CVE-2026-18573 has not been confirmed. Its EPSS score was 0.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-18573?

CVE-2026-18573 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

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