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CVE-2026-118959medium5.4

Keycloak-services: keycloak-services: required actions bypassed via kc_action parameter

Impact

A flaw in Keycloak's required action provider mechanism allows users to bypass mandatory challenges, such as profile verification, by including the kc_action query parameter in an authorization request. This can grant access to the application without completing necessary profile updates. The affected product is Red Hat Build of Keycloak.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

What to do

Mitigation 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.

redhat guidance

Affected packages

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Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Red Hat · redhat

Red Hat Build of Keycloak

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redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:build_keycloak:

Red Hat · redhat

Red Hat Build of Keycloak

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redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:build_keycloak:

Red Hat · redhat

Red Hat Single Sign-On 7

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redhat version evidence

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:red_hat_single_sign_on:7

Original source description

A flaw was found in the required action provider mechanism of Keycloak. The issue occurs when an authorization request includes the kc_action query parameter set to a mandatory action already assigned to the user, such as profile verification or terms and conditions. Due to incorrect handling of application-initiated actions, Keycloak may skip these mandatory challenges and issue an authorization code. This can allow a user to bypass administrative requirements and gain access to the application without completing necessary profile updates or agreeing to terms.

Inside the record

Evidence available

Package identity · not supplied
Version evidence · not supplied
Remediation guidance
Weakness classification
Additional publishers · not supplied

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Original records

CVE-2026-118959

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-287 ↗

Improper Authentication

redhat

Related →
Contributing organizations · 1
redhat

Assigning organization

2026-10-30

What changed

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References

2 sources
access.redhat.com/security/cve/CVE-2026-118959
vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi
issue-trackingredhat