CVE-2026-70429

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Jenkins User Impersonation via Case-Insensitive Name Matching

Publication date: 2026-08-05

Last updated on: 2026-10-24

Assigner: Jenkins Project

Description

Jenkins 2.575 and earlier, LTS 2.568.1 and earlier handles case-insensitivity in user names and group names inconsistently, allowing attackers able to create new users or groups with names that case-insensitively match other characters to impersonate other users or be granted their permissions in some circumstances.

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Meta Information

Published

2026-08-05

Last Modified

2026-10-24

Generated

2026-11-08

AI Q&A

2026-08-05

EPSS Evaluated

2026-11-07

NVD

CVE-2026-70429

EUVD

EUVD-2026-53523

Affected Vendors & Products

Vendor	Product	Version / Range
jenkins	jenkins	to 2.576 (exc)
jenkins	jenkins	to 2.568.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-178	The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results.

Attack-Flow Graph

Executive Summary

This vulnerability in Jenkins 2.575 and earlier versions allows attackers to create users or groups with names that case-insensitively match existing ones. This can lead to impersonation of other users or unauthorized access to their permissions due to inconsistent handling of case sensitivity in user and group names.

Detection Guidance

This vulnerability involves case-insensitive handling of usernames and group names in Jenkins. To detect it, check for duplicate or similar usernames/groups with varying cases. Review Jenkins logs for unusual permission assignments or user creations. No specific commands are provided in the context.

Impact Analysis

If you use an affected Jenkins version, attackers could impersonate legitimate users or gain unauthorized permissions by creating accounts with similar names. This may result in data breaches, unauthorized access to sensitive information, or disruption of services.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating compliance requirements under GDPR (data protection) and HIPAA (health information security). Organizations may face legal penalties, reputational damage, and loss of trust due to non-compliance.

Mitigation Strategies

Upgrade Jenkins to version 2.576 or later and LTS to 2.568.2 or later to address the case-insensitivity handling issue in user and group names.

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