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Medium

Observable timing discrepancy allows determining username validity in Jenkins

  • Disclosed: 24.06.2022
  • Updated: 11.10.2026 11:22

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. This allows attackers to determine the validity of attacker-specified usernames.

Login attempts with an invalid username now validate a synthetic password to eliminate the timing discrepancy in Jenkins 2.356, LTS 2.332.4.

Affected software

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PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) org.jenkins-ci.main:jenkins-core >= 2.334, < 2.356, < 2.332.4 2.356, 2.332.4

References

CVSS score 5.3/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE)
CWE-203, CWE-208
Platform
Java / Kotlin (Maven)
Package
org.jenkins-ci.main:jenkins-core
Disclosed
24.06.2022
Updated
11.10.2026 11:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-9grj-j43m-mjqr - CC BY 4.0

Vulnerability history: org.jenkins-ci.main:jenkins-core

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (259) in the archive
Total entries
259
First → latest
01.2022 06.2026
Without a fix
1
Exploited in attacks
4

Severity breakdown

  • Critical 19
  • High 62
  • Medium 158
  • Low 20

Disclosures per year

Severity:
  1. Jenkins arbitrary type deserialization from attacker-controlled config.xml allows remote code execution and user impersonation
    High · 8.8 CVE-2026-53435 < 2.555.3, >= 2.556, < 2.568 2.555.3, 2.568
  2. Jenkins: Stored XSS vulnerability in node offline cause description
    High · 8.0 CVE-2026-53441 >= 2.483, < 2.568 2.568
  3. Jenkins has a link following vulnerability allows arbitrary file creation
    High · 8.8 CVE-2026-33001 < 2.555 2.555
  4. Jenkins has a DNS rebinding vulnerability in WebSocket CLI origin validation
    High · 7.5 CVE-2026-33002 >= 2.442, < 2.555 2.555
  5. Jenkins has a stored XSS vulnerability in node offline cause description
    High · 8.0 CVE-2026-27099 >= 2.542, < 2.551, >= 2.483, < 2.541.2 2.551, 2.541.2
  6. Jenkins has a Denial of service vulnerability in HTTP-based CLI
    High · 7.5 CVE-2025-67635 >= 2.529, < 2.541, < 2.528.3 2.541, 2.528.3
  7. Jenkins Remoting library arbitrary file read vulnerability
    High · 9.0 CVE-2024-43044 < 2.452.4, >= 2.460, < 2.462.1, >= 2.470, < 2.471 2.452.4, 2.462.1, 2.471
  8. Arbitrary file read vulnerability through the Jenkins CLI can lead to RCE
    Critical · 9.8 Exploited in attacks CVE-2024-23897 >= 1.606, < 2.426.3, >= 2.427, < 2.440.1, >= 2.441, < 2.442 2.426.3, 2.440.1, 2.442
  9. Cross-site WebSocket hijacking vulnerability in the Jenkins CLI
    High · 8.8 CVE-2024-23898 >= 2.217, < 2.426.3, >= 2.427, < 2.442, = 2.441 2.426.3, 2.442
  10. Jenkins temporary plugin file created with insecure permissions
    High · 7.0 CVE-2023-43496 >= 2.50, < 2.414.2, >= 2.415, < 2.424 2.414.2, 2.424
  11. Jenkins Cross-site Scripting vulnerability
    High · 8.0 CVE-2023-43495 >= 2.50, < 2.414.2, >= 2.415, < 2.424 2.414.2, 2.424
  12. Jenkins Stored Cross-site Scripting vulnerability
    High · 8.0 CVE-2023-39151 >= 2.402, < 2.414.1, < 2.401.3, >= 2.415, < 2.416 2.414.1, 2.401.3, 2.416
  13. Jenkins CSRF protection bypass vulnerability
    High · 8.0 CVE-2023-35141 < 2.400 2.400
  14. Cross-site Scripting vulnerability in Jenkins
    High · 8.8 CVE-2023-27898 >= 2.376, < 2.394, < 2.375.4 2.394, 2.375.4
  15. Incorrect Authorization in Jenkins Core
    High · 7.0 CVE-2023-27899 >= 2.376, < 2.387.1, < 2.375.4, >= 2.388, < 2.394 2.387.1, 2.375.4, 2.394
  16. Denial of service in Jenkins Core
    High · 7.5 CVE-2023-27901 >= 2.388, < 2.394, < 2.375.4, >= 2.376, < 2.387.1 2.394, 2.375.4, 2.387.1
  17. Jenkins vulnerable to stored cross site scripting in the I:helpIcon component
    High · 8.0 CVE-2022-41224 >= 2.367, < 2.370 2.370
  18. Cross-site Scripting vulnerability in Jenkins
    High · 8.0 CVE-2022-34170 >= 2.350, < 2.356, >= 2.320, < 2.332.4, >= 2.346, < 2.346.1 2.356, 2.332.4, 2.346.1
  19. Observable timing discrepancy allows determining username validity in Jenkins this entry
    Medium · 5.3 CVE-2022-34174 >= 2.334, < 2.356, < 2.332.4 2.356, 2.332.4
  20. Unauthorized view fragment access in Jenkins
    High · 7.5 CVE-2022-34175 >= 2.335, < 2.356 2.356
  21. Cross-site Scripting vulnerability in Jenkins
    High · 8.0 CVE-2022-34173 >= 2.340, < 2.356 2.356
  22. Cross-site Scripting vulnerability in Jenkins
    High · 8.0 CVE-2022-34172 >= 2.340, < 2.356, >= 2.332, < 2.332.4 2.356, 2.332.4
  23. Cross-site Scripting vulnerability in Jenkins
    High · 8.0 CVE-2022-34171 >= 2.350, < 2.356, >= 2.346, < 2.346.1, < 2.332.4 2.356, 2.346.1, 2.332.4
  24. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21686 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  25. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21685 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  26. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21689 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  27. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21690 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  28. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21692 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  29. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21693 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  30. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21694 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  31. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21688 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  32. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21691 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  33. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21687 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  34. Agent-to-controller access control allowed writing to sensitive directory used by Jenkins Pipeline: Shared Groovy Libraries Plugin
    High · 8.8 CVE-2021-21696 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  35. Agent-to-controller access control allows reading/writing most content of build directories in Jenkins
    Critical · 9.1 CVE-2021-21697 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  36. Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
    Critical · 9.0 CVE-2021-21695 < 2.303.3, >= 2.304, < 2.319 2.303.3, 2.319
  37. Session fixation vulnerability in Jenkins
    High · 7.5 CVE-2021-21671 >= 2.292, < 2.300, < 2.289.2 2.300, 2.289.2
  38. Path traversal vulnerability in Jenkins agent names
    High · 8.0 CVE-2021-21605 < 2.263.2, >= 2.264, < 2.275 2.263.2, 2.275
  39. Improper handling of REST API XML deserialization errors in Jenkins
    High · 8.0 CVE-2021-21604 < 2.263.2, >= 2.264, < 2.275 2.263.2, 2.275
  40. Jenkins Cross-site Scripting vulnerability in project naming strategy
    High · 8.0 CVE-2020-2230 < 2.235.4, >= 2.236, < 2.252 2.235.4, 2.252
Show more (20) Showing 40 of 82

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