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JBoss EAP Elytron CVE-2026-85511

| EUVDEUVD-2026-82946 MEDIUM
Authentication Bypass by Spoofing (CWE-290)
2026-09-18 redhat GHSA-mp6j-4f9f-mcr2
Authentication Bypass Java Red Hat Jboss Enterprise Application Platform 8 Red Hat Jboss Enterprise Application Platform Expansion Pack Red Hat Jboss Enterprise Application Platform 7 Red Hat
4.2
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
4.2 MEDIUM
AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
vuln.today AI
4.8 MEDIUM

Attacker spoofing a token against an auth endpoint is pre-authentication (PR:N); AC:H because success depends on the introspection endpoint's parameter parsing; low confidentiality/integrity, no availability.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Metadata Corrected
Sep 18, 2026 - 15:40 vuln.today
tag: Java added
Analysis Generated
Sep 18, 2026 - 15:19 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Parameter substitution in the Elytron token-realm of Red Hat JBoss EAP 7, JBoss EAP 8 and the EAP Expansion Pack allows a remote attacker to manipulate OAuth2 token-introspection requests because parameters are assembled without URL encoding. Only deployments whose application security domain is backed by a token-realm configured with oauth2-introspection are exposed; other realm types (properties, JDBC, LDAP, or JWT validation without introspection) are unaffected, and the achievable impact is limited to Low confidentiality and Low integrity with no availability impact. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation Exploitation requires a specific, non-default configuration: the EAP application's security domain must be backed by an Elytron token-realm configured with oauth2-introspection. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but modest-severity flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch version is identified in the available intelligence for CVE-2026-85511, so verify current errata and update status directly against the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-85511 and Bugzilla 2483140 (https://bugzilla.redhat.com/show_bug.cgi?id=2483140) before planning changes. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-85511 vulnerability details – vuln.today
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