CVE-2026-85511Network attack vector

IdP request manipulation via unencoded introspection tokens

Published Sep 18, 2026 · Updated Sep 18, 2026

Parameter injection in Elytron in Red Hat JBoss Enterprise Application Platform 8.0 allows remote authenticated users to alter IdP requests. Elytron forwards a malformed OAuth 2 introspection token without URL encoding, so attacker-controlled data becomes additional request parameters. Exposure requires a security domain backed by a token-realm with oauth2-introspection; standard IdPs reject malformed requests, preventing authentication bypass.

CVSS severity4.2
Medium
EPSS probability0.28%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Parameter injection in Elytron in Red Hat JBoss Enterprise Application Platform 8.0 allows remote authenticated users to alter IdP requests. Elytron forwards a malformed OAuth 2 introspection token without URL encoding, so attacker-controlled data becomes additional request parameters. Exposure requires a security domain backed by a token-realm with oauth2-introspection; standard IdPs reject malformed requests, preventing authentication bypass.

The record

CVE
CVE-2026-85511
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Commonhaus Foundation
Product
Red Hat JBoss Enterprise Application Platform 8.0
Classifications
CWE-290
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Commonhaus Foundation · Red Hat JBoss Enterprise Application Platform 8.0Affected versions are unavailable in this record.

Published CVSS scores

4.2Red HatCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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