---
id: "CVE-2026-93744"
kind: "vulnerability"
aliases: ["CVE-2026-93744"]
title: "IBM i Navigator: unauthenticated HTTP request can alter session security state"
severity: "medium"
cvss: 6.5
epss: 0.00388
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["ibm-i", "ibm-navigator", "infrastructure", "self-hosted"]
not_affected_if: ["navigator-not-installed", "network-restricted"]
published_at: "2026-10-20T22:21:07+00:00"
first_seen_at: "2026-10-23T21:57:27+00:00"
updated_at: "2026-10-25T03:49:14+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93744", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-93744", "first_seen_at": "2026-10-24T13:15:55+00:00"}]
---

# IBM i Navigator: unauthenticated HTTP request can alter session security state

IBM i 7.3 through 7.6 Navigator accepts a specially crafted HTTP request to any URL before authentication. An unauthenticated remote attacker can use it to change server-side session security state and bypass security restrictions.

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

## How to check

- Confirm the IBM i release with `WRKPTFGRP` or `GO LICPGM` and compare against the affected releases 7.3, 7.4, 7.5 and 7.6
- Check whether IBM Navigator for i is installed and reachable from untrusted networks
- unknown for the exact PTF or Navigator build that contains the fix

## Fix

- Apply the IBM PTF or Navigator update for IBM i 7.3, 7.4, 7.5 or 7.6 from IBM's security bulletin
- Restrict access to the Navigator HTTP port to trusted networks until patched
- unknown for the exact fixed PTF level, as the sources do not name it

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-93744
- 2026-10-24T13:15:55+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-93744

## From the sources

IBM i 7.3, 7.4, 7.5, and 7.6 could allow an unathenticated remote attacker to bypass security restrictions due to improper access control. By sending a specially crafted HTTP request to any URL within the Navigator application prior to authentication, a bad actor could exploit this vulnerability to alter server-side session security state.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_