In Jenkins 2.355 and earlier, LTS 2.332.3 and earlier, an observable timing discrepancy on the login form allows distinguishing between login attempts with an invalid username, and login attempts with a valid username and wrong password, when using the Jenkins user database security realm.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| org.jenkins-ci.main:jenkins-core(Maven) | 2.334 | 2.356 | N/A |
| org.jenkins-ci.main:jenkins-core(Maven) | 0 | 2.332.4 | N/A |
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