---
id: "CVE-2026-4405"
kind: "vulnerability"
aliases: ["CVE-2026-4405"]
title: "IBM Concert: cached web pages readable by other local users"
severity: "medium"
cvss: 4.0
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["ibm-concert", "self-hosted", "shared-workstation", "vendor"]
not_affected_if: ["single-user-machine", "unaffected-version"]
published_at: "2026-10-19T18:17:07+00:00"
first_seen_at: "2026-10-23T21:57:18+00:00"
updated_at: "2026-10-25T04:41:57+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4405", "first_seen_at": "2026-10-23T21:57:18+00:00"}]
---

# IBM Concert: cached web pages readable by other local users

IBM Concert versions 1.0 through 3.0.0 store web page content in a local cache. Another user on the same machine can read that cached content.

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

## How to check

- Confirm whether IBM Concert is installed and which version is running, against the affected range `1.0` through `3.0.0`
- unknown

## Fix

- Move to an IBM Concert release newer than `3.0.0` as published in the IBM advisory
- unknown

## Timeline

- 2026-10-23T21:57:18+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-4405

## From the sources

IBM Concert 1.0 through 3.0.0 allows web page cache to be stored locally which can be read by another user on the system.

---

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