CVE-2026-19625Network attack vector

Cross-tenant access via shared introspection cache

Published Sep 8, 2026 · Updated Sep 10, 2026

Authentication bypass in IBM Enterprise Build of Quarkus 3.27.1 through 3.27.5 and 3.33.1 through 3.33.3 allows remote attackers cross-tenant access. The OIDC component keys shared token-introspection cache entries by token without binding the cached result to the tenant that validated it. Exploitation requires multiple OIDC tenants, enabled introspection caching, and a valid token for one tenant; protected resources assigned to another tenant can then be read.

CVSS severity5.3
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in IBM Enterprise Build of Quarkus 3.27.1 through 3.27.5 and 3.33.1 through 3.33.3 allows remote attackers cross-tenant access. The OIDC component keys shared token-introspection cache entries by token without binding the cached result to the tenant that validated it. Exploitation requires multiple OIDC tenants, enabled introspection caching, and a valid token for one tenant; protected resources assigned to another tenant can then be read.

The record

CVE
CVE-2026-19625
Published
Sep 8, 2026
Updated
Sep 10, 2026
Vendor
IBM
Product
IBM Enterprise Build of Quarkus
Classifications
CWE-524, CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.27.1 <=3.27.5
  2. Affected versionversion=3.33.1 <=3.33.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Enterprise Build of Quarkusversion=3.27.1 <=3.27.5; version=3.33.1 <=3.33.3

Published CVSS scores

8.7Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
5.3IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-524Use of Cache Containing Sensitive Information
CWE-284Improper Access Control
T1190Exploit Public-Facing Application

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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