---
id: CVE-2026-18572
title: >-
  Keycloak provides authorization services that allow administrators to restrict
  access to resources based on time policies (for example, only allowing access
  during business hours)
summary: >-
  Keycloak provides authorization services that allow administrators to restrict
  access to resources based on time policies (for example, only allowing access
  during business hours). A flaw was discovered where a user can include a fake
  ti…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-863
vendor: redhat
product: build_of_keycloak
affected:
  - build_of_keycloak
patched:
  - build_of_keycloak 26.6.7
published: '2026-08-02'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:17:09.783'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18572'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:68277'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:68278'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-18572'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2509763'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18572.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-18572'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18572'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.0039
epssPercentile: 0.304
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-03T15:51:08.005640Z'
ingestedAt: '2026-08-02T13:18:29.774Z'
---

## Overview

Keycloak provides authorization services that allow administrators to restrict access to resources based on time policies (for example, only allowing access during business hours). A flaw was discovered where a user can include a fake time value in their authorization request that overrides the actual server time. This allows the user to bypass these time-based restrictions and access protected resources at unauthorized times.

## Affected

- `build_of_keycloak`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:68278** · Red Hat · fixed in: Red Hat build of Keycloak 26.6.7 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68278)
- **RHSA-2026:68277** · Red Hat · fixed in: Red Hat build of Keycloak 26.6 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68277)