AIKIDO-2026-178738
jenkins-core is vulnerable to Improper Handling of Case Sensitivity
78
CVE Score
High
Improper Handling of Case Sensitivity
TL;DR
User and group name handling mixes lowercase canonical IDs with String#equalsIgnoreCase comparisons that treat some Unicode characters as equal when lowercasing does not. An attacker who can create users or groups with names that match this way can impersonate other users or inherit their permissions when the security realm allows those characters. The fix compares names by canonical form only.
How do I fix this?
Upgrade the org.jenkins-ci.main:jenkins-core library to the patch version.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and use a security realm that allows creating users or groups whose names case-insensitively match existing ones with non-ASCII characters.
Package
Versions
0.0.1 - 2.568.1
Fixed in 2.568.22.569 - 2.575
Fixed in 2.576Background info
jenkins-core is vulnerable to Improper Handling of Case Sensitivity in versions 0.0.1 - 2.568.1 and 2.569 - 2.575.
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