---
id: "CVE-2026-17301"
page: "https://infrastack.ai/live/CVE-2026-17301"
kind: "vulnerability"
aliases: ["CVE-2026-17301"]
title: "IBM API Connect: unauthenticated attacker can bypass authentication via signature flaw"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "api-connect", "fixed": ["10.0.8.13"], "affected": ">= 10.0.8.0, <= 10.0.8.12", "ecosystem": "vendor"}, {"name": "api-connect-v12-onprem", "fixed": ["12.1.1.3"], "affected": ">= 12.1.0.0, <= 12.1.1.2", "ecosystem": "vendor"}]
ecosystems: []
tags: ["api-gateway", "ibm-api-connect", "infrastructure", "self-hosted"]
not_affected_if: ["versions-outside-affected-ranges"]
published_at: "2026-11-07T05:18:37+00:00"
first_seen_at: "2026-11-07T05:46:02+00:00"
updated_at: "2026-11-07T05:56:22+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-17301", "first_seen_at": "2026-11-07T05:46:02+00:00"}, {"source": "analyst", "url": "https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-41", "first_seen_at": "2026-11-07T05:56:22+00:00", "cites": ["https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-41", "https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39"]}]
exploit_sources: []
---

# IBM API Connect: unauthenticated attacker can bypass authentication via signature flaw

Link for people: https://infrastack.ai/live/CVE-2026-17301 (this .md is for agents)

IBM API Connect versions 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 do not properly verify a cryptographic signature. An unauthenticated attacker can use this to bypass authentication.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:api-connect affected >= 10.0.8.0, <= 10.0.8.12 fixed 10.0.8.13
- vendor:api-connect-v12-onprem affected >= 12.1.0.0, <= 12.1.1.2 fixed 12.1.1.3

## How to check

Check your API Connect version. Affected: 10.0.8.0 through 10.0.8.12, and 12.1.0.0 through 12.1.1.2 (V12 OnPrem). Fixed: 10.0.8.13 and 12.1.1.3. IBM lists no workaround.

## Fix

Upgrade API Connect 10.0.8.x to 10.0.8.13, or 12.1.x to 12.1.1.3. IBM lists no workarounds or interim fixes.

## Timeline

- 2026-11-07T05:46:02+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-17301
- 2026-11-07T05:56:22+00:00 analyst https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-41 — Read IBM bulletins -41 (10.0.8.x, fix 10.0.8.13) and -39 (12.1.x, fix 12.1.1.3); both list CVE-2026-17301, CWE-347, CVSS 9.8, no workarounds, no interim fixes. Bulletin metadata ranges differ by one version from tables; used tables. No exploitation/PoC seen (didn't search social).

## Documents

- [advisory] IBM Security Bulletin: Multiple Vulnerabilities in IBM API Connect (10.0.8.13) https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-41
- [advisory] IBM Security Bulletin: Multiple Vulnerabilities in IBM API Connect (v12.1.1.3) https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39

## From the sources

IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow an unauthenticated attacker to bypass authentication due to improper verification of a cryptographic signature.

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