CVE-2026-17358: Multiple Vulnerabilities in IBM API Connect

Q: Which IBM API Connect versions should be reviewed?

Review IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2.

Q: Does exploitation require an existing account?

Yes. The issue is described as exploitable by a remote authenticated attacker, meaning the attacker must be authenticated in one tenant before attempting to be accepted by another tenant.

Q: Which environments are exposed to the cross-tenant impact?

Environments using tenant separation are relevant because the flaw involves authentication checks that are not sufficiently isolated between tenants. A user from one tenant could be accepted by another tenant.

Published Nov 5, 2026

Updated

IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to bypass authentication across tenants due to improper authentication. Authentication checks are not sufficiently isolated between tenants, which could allow a user from one tenant to be accepted by another.

Other sources

IBM API Connect could allow a remote authenticated attacker to bypass authentication across tenants due to improper authentication. Authentication checks are not sufficiently isolated between tenants, which could allow a user from one tenant to be accepted by another.

— IBM

Affected Software

1 affected component

IBM API Connect<=V10.0.8.0 - V10.0.8.12

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade IBM API Connect to a version that resolves this vulnerability.
Fixed in 10.0.8.13
Upgrade
Upgrade IBM API Connect to a version that resolves this vulnerability.
Fixed in 12.1.1.3

Event History

Nov 5, 2026

CVE Published

via IBM·12:00 AM

Data Sourced

via IBM·12:00 AM

DescriptionAffected Software

Nov 7, 2026

CVE Published

via MITRE·04:33 AM

Data Sourced

via MITRE·04:33 AM

RemedyDescriptionSeverityWeakness

Data Sourced

via NVD·05:18 AM

DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

IBM-7295637

Frequently Asked Questions

Which IBM API Connect versions should be reviewed?

Review IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2.

Does exploitation require an existing account?

Yes. The issue is described as exploitable by a remote authenticated attacker, meaning the attacker must be authenticated in one tenant before attempting to be accepted by another tenant.

Which environments are exposed to the cross-tenant impact?

Environments using tenant separation are relevant because the flaw involves authentication checks that are not sufficiently isolated between tenants. A user from one tenant could be accepted by another tenant.

CVE-2026-17358: Multiple Vulnerabilities in IBM API Connect

Other sources

Affected Software

Remediation

Event History

Parent advisories

Frequently Asked Questions

Which IBM API Connect versions should be reviewed?

Does exploitation require an existing account?

Which environments are exposed to the cross-tenant impact?

Company

Resources

Contact

Frequently Asked Questions

Which IBM API Connect versions should be reviewed?

Does exploitation require an existing account?

Which environments are exposed to the cross-tenant impact?