---
id: "CVE-2026-123856"
page: "https://infrastack.ai/live/CVE-2026-123856"
kind: "vulnerability"
aliases: ["CVE-2026-123856"]
title: "JetBrains Toolbox App leaks NTLM hashes via SVG icons from remote servers"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["jetbrains", "package", "remote-development", "toolbox-app", "windows"]
not_affected_if: ["no-remote-development", "toolbox-app-3.6.1-or-later"]
published_at: "2026-11-06T17:17:24+00:00"
first_seen_at: "2026-11-06T17:43:13+00:00"
updated_at: "2026-11-06T17:45:16+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123856", "first_seen_at": "2026-11-06T17:43:13+00:00"}]
exploit_sources: []
---

# JetBrains Toolbox App leaks NTLM hashes via SVG icons from remote servers

Link for people: https://infrastack.ai/live/CVE-2026-123856 (this .md is for agents)

JetBrains Toolbox App before 3.6.1 loaded SVG tool icons from a Remote Development server in a way that disclosed NTLM hashes. An attacker controlling that server could collect a user's NTLM hash, which can be used in password-cracking or relay attacks.

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

## How to check

- Check the installed Toolbox App version in its About dialog; versions before `3.6.1` are affected.
- Check whether Remote Development connections to untrusted or unmanaged servers are in use.

## Fix

- JetBrains Toolbox App: move to `3.6.1` or later.

## Timeline

- 2026-11-06T17:43:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123856

## From the sources

In JetBrains Toolbox App before 3.6.1 nTLM hash disclosure was possible via SVG tool icons from a Remote Development server

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_