---
id: "CVE-2026-118959"
kind: "vulnerability"
aliases: ["CVE-2026-118959"]
title: "Keycloak: crafted login request can skip mandatory user actions"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["keycloak", "runtime", "self-hosted", "sso"]
not_affected_if: ["managed-identity-service", "no-required-actions"]
published_at: "2026-10-30T01:16:44+00:00"
first_seen_at: "2026-10-30T01:27:58+00:00"
updated_at: "2026-10-30T01:29:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118959", "first_seen_at": "2026-10-30T01:27:58+00:00"}]
---

# Keycloak: crafted login request can skip mandatory user actions

A crafted authorization request with the kc_action parameter can make Keycloak skip required steps such as profile verification or terms acceptance and issue an authorization code. An attacker who has a valid account can reach the application without completing those mandatory steps.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Keycloak version in use against the affected ranges in the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-118959)
- Review whether the realm uses required actions such as profile verification or terms and conditions, since those are what can be skipped

## Timeline

- 2026-10-30T01:27:58+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118959

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_