---
id: "CVE-2026-17338"
page: "https://infrastack.ai/live/CVE-2026-17338"
kind: "vulnerability"
aliases: ["CVE-2026-17338"]
title: "IBM API Connect V12 OnPrem: logged-in user can read other users' sensitive data via broken authorization (fixed in 12.1.1.3)"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "vendor"
products: [{"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", "authenticated", "ibm-api-connect", "self-hosted", "vendor"]
not_affected_if: ["unknown", "v12.1.1.3-or-later"]
published_at: "2026-11-07T05:18:45+00:00"
first_seen_at: "2026-11-07T05:46:04+00:00"
updated_at: "2026-11-07T05:55:03+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-17338", "first_seen_at": "2026-11-07T05:46:04+00:00"}, {"source": "analyst", "url": "https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39", "first_seen_at": "2026-11-07T05:55:03+00:00", "cites": ["https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39"]}]
exploit_sources: []
---

# IBM API Connect V12 OnPrem: logged-in user can read other users' sensitive data via broken authorization (fixed in 12.1.1.3)

Link for people: https://infrastack.ai/live/CVE-2026-17338 (this .md is for agents)

IBM API Connect V12 OnPrem v12.1.0.0 through v12.1.1.2 does not enforce object-level authorization, so a remote authenticated attacker can obtain sensitive information. IBM rates it CVSS 9.1 and fixes it in v12.1.1.3.

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

## Affected

- 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 V12 OnPrem version; v12.1.0.0 through v12.1.1.2 are affected, v12.1.1.3 contains the fix. IBM lists only V12 OnPrem for this bulletin; if you run another API Connect offering, check IBM's bulletins or ask IBM support.

## Fix

Upgrade IBM API Connect V12 OnPrem to v12.1.1.3 (Fix Central: https://www.ibm.com/support/pages/node/7290205)

## Timeline

- 2026-11-07T05:46:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-17338
- 2026-11-07T05:55:03+00:00 analyst https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39 — IBM bulletin -39 (2026-11-05) lists CVE-2026-17338 (CWE-639, CVSS 9.1, remote authenticated); affects API Connect V12 OnPrem v12.1.0.0-v12.1.1.2, fix v12.1.1.3, workarounds none. No exploitation or PoC seen in sources (Feedly says none).

## Documents

- [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 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to obtain sensitive information due to broken object-level authorization.

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