CVE-2026-4366Network attack vector

Unauthenticated blind SSRF via redirected configuration URLs

Published Mar 18, 2026 · Updated Mar 18, 2026

Blind SSRF in Red Hat Keycloak-based products allows remote attackers to reach internal resources through redirected configuration URLs. The sector_identifier_uri and OIDC request_uri fetch paths followed HTTP 3xx responses without validating the final destination URL. No authentication or user interaction is required; successful requests can expose metadata services and map otherwise restricted internal hosts.

CVSS severity5.8
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Blind SSRF in Red Hat Keycloak-based products allows remote attackers to reach internal resources through redirected configuration URLs. The sector_identifier_uri and OIDC request_uri fetch paths followed HTTP 3xx responses without validating the final destination URL. No authentication or user interaction is required; successful requests can expose metadata services and map otherwise restricted internal hosts.

The record

CVE
CVE-2026-4366
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
389 Directory Server
Product
Red Hat JBoss Enterprise Application Platform Expansion Pack
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat JBoss Enterprise Application Platform Expansion PackAffected versions are unavailable in this record.
389 Directory Server · Red Hat Single Sign-On 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat build of KeycloakAffected versions are unavailable in this record.
389 Directory Server · Red Hat JBoss Enterprise Application PlatformAffected versions are unavailable in this record.

Published CVSS scores

5.8Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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