---
title: "CVE-2026-100277: JetBrains YouTrack - Authentication Bypass"
description: "JetBrains YouTrack < 2026.2.19197 contains an account takeover vulnerability caused by replaying a notification signature, letting attackers take over user accounts, exploit requires replaying a valid notification signature."
url: https://panop.io/threat-heartbeat/CVE-2026-100277/
---

# CVE-2026-100277 JetBrains YouTrack - Authentication Bypass

JetBrains YouTrack < 2026.2.19197 contains an account takeover vulnerability caused by replaying a notification signature, letting attackers take over user accounts, exploit requires replaying a valid notification signature.

CVSS base score 8.9 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.28% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100277)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

Published

30 September 2026

Updated

15 October 2026

Weakness

[CWE-863](https://cwe.mitre.org/data/definitions/863.html)

## Vendor fix

Update to version 2026.2.19197 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-100277](https://nvd.nist.gov/vuln/detail/CVE-2026-100277)
- [https://www.jetbrains.com/privacy-security/issues-fixed/](https://www.jetbrains.com/privacy-security/issues-fixed/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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