JetBrains YouTrack: authentication bypass

JetBrains YouTrack

In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address

Do this now

Review YouTrack Helpdesk accounts for unauthorized takeover and apply the fixed release when available.

First seen: 23 Oct 2026
Last update: 23 Oct 2026, 19:39 UTC
Identifiers: CVE-2026-86478
CVSS: 9.8
Source: news

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## JetBrains YouTrack: authentication bypass
Severity: critical. Patch status: fix status unknown.
Affected: JetBrains YouTrack
Ids: CVE-2026-86478

In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address

## Steps
1. Search the repo, its CI and infra config for JetBrains YouTrack. If present, report the version in use and whether it's affected.
2. There is no fix yet. Until one ships: In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-86478") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://nvd.nist.gov/vuln/detail/CVE-2026-86478 https://www.jetbrains.com/privacy-security/issues-fixed/
https://pwned.coffee/i/in-jetbrains-youtrack-before-2025-3-161254-2026-1-14042-cve-2026-86478

Timeline

23 Oct 2026, 19:40 UTC
Proof-of-concept code for CVE-2026-86478 is public on GitHub. Unverified, but expect scanning to follow.
23 Oct 2026
First reported.

Sources

Totalone very hot coffee