CVE-2026-118959— Keycloak-services: keycloak-services: required actions bypassed via kc_action parameter

Quick assessment

Affected

Red Hat Red Hat Build of Keycloak

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Keycloak 的“必需操作提供程序机制”中发现了一个漏洞。当授权请求中包含查询参数，且该参数被设置为已分配给用户的必需操作（例如个人资料验证或条款与条件确认）时，会触发此问题。由于对应用发起的操作处理不当，Keycloak 可能会跳过这些强制性的挑战步骤，并直接颁发授权码。这可能导致用户绕过管理要求，在未完成必要的个人资料更新或未同意相关条款的情况下，获得对应用的访问权限。

CVSS 5.4 · Medium Updated Oct 30, 2026

Possible ATT&CK Techniques 2 AI

T1550 · Use Alternate Authentication Material T1551.003

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

认证机制不恰当

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat Build of Keycloak	-	`cpe:/a:redhat:build_keycloak:`
Red Hat	Red Hat Build of Keycloak	-	`cpe:/a:redhat:build_keycloak:`
Red Hat	Red Hat Single Sign-On 7	-	`cpe:/a:redhat:red_hat_single_sign_on:7`

II. Public POCs for CVE-2026-118959

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-118959

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Other References for CVE-2026-118959 (2)

https://access.redhat.com/security/cve/CVE-2026-118959 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2563288 issue-tracking x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-118959

Same Patch Batch · Red Hat · 2026-10-30 · 7 CVEs total

CVE-2026-103963	7.5 HIGH	Glib-networking: unbounded tls 1.3 session ticket queue growth in glib-networking allows r
CVE-2026-91920	6.5 MEDIUM	Undertow: undertow: chunkreader message length permits chunk-size overflow
CVE-2026-110133	5.8 MEDIUM	Ghostscript: heap buffer overflow in ghostscript truetype outliner due to npointstotal int
CVE-2026-118947	4.3 MEDIUM	Keycloak-services: keycloak-services: authorization bypass via uma resource registration i
CVE-2026-118475	3.6 LOW	Eog: eye of gnome: buffer overrun when parsing malicious png files with non-standard iccp
CVE-2026-112922	3.3 LOW	Ghostscript: out-of-bounds read in ghostscript shade_next_color via integer overflow of in

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak

Same vendor: Red Hat

Same weakness: CWE-287