Prototype Pollution in JetBrains YouTrack

Publication date: 2026-06-26

Last updated on: 2026-06-27

Assigner: JetBrains s.r.o.

Description

In JetBrains YouTrack before 2026.2.16593 the websandbox bridge was vulnerable to a prototype pollution attack

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-26

Last Modified

2026-06-27

Generated

2026-07-17

AI Q&A

2026-06-26

EPSS Evaluated

2026-07-15

NVD

CVE-2026-57926

EUVD

EUVD-2026-39658

Affected Vendors & Products

Vendor	Product	Version / Range
jetbrains	youtrack	to 2026.2.16593 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1321	The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

Attack-Flow Graph

Executive Summary

This vulnerability exists in JetBrains YouTrack versions before 2026.2.16593 and involves the websandbox bridge being susceptible to a prototype pollution attack.

Impact Analysis

The vulnerability has a low CVSS base score of 2.6, indicating limited impact. It requires network access with high attack complexity, low privileges, and user interaction. The impact is limited to integrity loss without affecting confidentiality or availability.

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