---
id: CVE-2026-85511
title: A flaw was found in EAP's Elytron
summary: >-
  A flaw was found in EAP's Elytron. An EAP application whose security domain is
  backed by an Elytron token-realm with oauth2-introspection would allow
  parameter substitution due to missing URL encoding.
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-290
vendor: Red Hat
product: wildfly-elytron-realm-token
affected:
  - wildfly-elytron-realm-token
  - wildfly-elytron-realm-token (all versions)
  - wildfly-elytron-realm-token
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:06:08.407'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85511'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-85511'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2483140'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T16:43:50.598569Z'
ingestedAt: '2026-09-18T14:43:13.066Z'
epss: 0.00131
epssPercentile: 0.03107
---

## Overview

A flaw was found in EAP's Elytron. An EAP application whose security domain is backed by an Elytron token-realm with oauth2-introspection would allow parameter substitution due to missing URL encoding.

## Remediation

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