---
id: "CVE-2026-123323"
page: "https://infrastack.ai/live/CVE-2026-123323"
kind: "vulnerability"
aliases: ["CVE-2026-123323"]
title: "JetBrains YouTrack: app widget host lets apps send REST requests unconfirmed"
severity: "high"
cvss: 8.4
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["jetbrains", "runtime", "self-hosted", "youtrack"]
not_affected_if: ["no-app-widgets", "patched-version"]
published_at: "2026-11-06T11:17:11+00:00"
first_seen_at: "2026-11-06T11:41:27+00:00"
updated_at: "2026-11-06T11:41:48+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123323", "first_seen_at": "2026-11-06T11:41:27+00:00"}]
exploit_sources: []
---

# JetBrains YouTrack: app widget host lets apps send REST requests unconfirmed

Link for people: https://infrastack.ai/live/CVE-2026-123323 (this .md is for agents)

JetBrains YouTrack before 2025.3.170763, 2026.1.14150 and 2026.2.19656 fails to validate URLs in its app widget host. A malicious or compromised app widget can send REST requests to YouTrack without asking the user to confirm, so it can act with the user's privileges.

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

## How to check

- Check the installed YouTrack version in the About page or the server admin panel and compare it with the fixed versions `2025.3.170763`, `2026.1.14150`, `2026.2.19656`.
- Review which app widgets or apps are installed in YouTrack.

## Fix

- JetBrains YouTrack: move to `2025.3.170763`, `2026.1.14150` or `2026.2.19656` (the fixed version on your release line).

## Timeline

- 2026-11-06T11:41:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123323

## From the sources

In JetBrains YouTrack before 2025.3.170763, 
2026.1.14150, 
2026.2.19656 improper URL validation in the app widget host allowed apps to send REST requests without user confirmation

---

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