---
id: "CVE-2026-17339"
page: "https://infrastack.ai/live/CVE-2026-17339"
kind: "vulnerability"
aliases: ["CVE-2026-17339"]
title: "IBM API Connect V12 OnPrem: logged-in user can reach other tenants' resources via path traversal (fixed in 12.1.1.3)"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
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", "ibm-api-connect", "infrastructure", "multi-tenant", "self-hosted"]
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: "2026-11-07T05:54:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-17339", "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": "2026-11-07T05:54:06+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 reach other tenants' resources via path traversal (fixed in 12.1.1.3)

Link for people: https://infrastack.ai/live/CVE-2026-17339 (this .md is for agents)

IBM API Connect versions 12.1.0.0 through 12.1.1.2 contain a path traversal flaw that lets a remote, logged-in user reach resources belonging to other tenants. An attacker can access or delete those resources.

_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; versions v12.1.0.0 through v12.1.1.2 are affected. v12.1.1.3 contains the fix. Only IBM's V12 OnPrem is listed; if you run another API Connect offering, check IBM's bulletin 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-2026-17339
- 2026-11-07T05:54:06+00:00 analyst https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39 — IBM bulletin (multiple-vulnerabilities-ibm-api-connect-39, 2026-11-05): affected V12 OnPrem v12.1.0.0-v12.1.1.2, fix v12.1.1.3, workarounds none. Not exploited per sources; no PoC found.

## 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 access or delete resources belonging to other tenants due to path traversal.

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