Reported vulnerability
Stop User Enumeration <= 1.3.8 - Unauthenticated Username Enumeration
Published 4 Jan 2017
Updated 22 Jan 2024
CVE-2017-1000226
Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.
Does this affect my version?
Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.
Wordfence advisory
medium · CVSS 5.3The Stop User Enumeration plugin for WordPress is vulnerable to Username Enumeration in versions up to, and including, 1.3.8 via the due to the REST API. This makes it possible for unauthenticated attackers to generate lists of usernames gathered from vulnerable services.
Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Stop User Enumeration
- Software
- plugin · stop-user-enumeration
- Affected versions
- Start version unspecified, through 1.3.8
- Fix availability
- Fix available
- Fixed versions
- 1.3.9
Recommended action
Update to version 1.3.9, or a newer patched version
Further references (1)
Data sources and licences
Copyright 2012-2026 Defiant Inc.
Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.
Read licence termsCopyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
Read licence termsSource: Wordfence
Wordfence advisory
medium · CVSS 5.3The Stop User Enumeration plugin for WordPress is vulnerable to User Enumeration in versions up to, and including, 1.3.8. This is due to a flaw that was found in the REST API. This makes it possible for unauthenticated attackers to perform a POST request in the REST API allows simulating different request types. As such, attackers can perform a POST request with the “users” string in the body of the request, and tell the REST API to act like it’s received a GET request.
Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Stop User Enumeration
- Software
- plugin · stop-user-enumeration
- Affected versions
- Start version unspecified, before 1.3.9
- Fix availability
- Fix available
- Fixed versions
- 1.3.9
Recommended action
Update to version 1.3.9, or a newer patched version
Further references (1)
Data sources and licences
Copyright 2012-2026 Defiant Inc.
Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.
Read licence termsCopyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
Read licence termsSource: Wordfence
Need help fixing this issue?
Get help checking your site, applying an available update and resolving any problems after updating.
Get help with this issueQuestions about this vulnerability
Which versions of Stop User Enumeration are affected?
Wordfence lists these affected versions: Start version unspecified, through 1.3.8. Use the version checker above to compare your installed release with this report. Wordfence lists these affected versions: Start version unspecified, before 1.3.9. Use the version checker above to compare your installed release with this report.
Is a fix available for Stop User Enumeration?
Wordfence reports a fix for this issue in Stop User Enumeration. It lists these fixed versions: 1.3.9. Back up your website and test the recommended update before applying it to your live site. Wordfence reports a fix for this issue in Stop User Enumeration. It lists these fixed versions: 1.3.9. Back up your website and test the recommended update before applying it to your live site.
Where can I find my installed plugin version?
In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.
Does an affected version mean my website has been hacked?
An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.
Other reports for the same product
These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.
- Stop User Enumeration <= 1.7.2 - Protection Mechanism BypassUpdated 25 Jul 2025
- Freemius SDK <= 2.5.9 - Reflected Cross-Site Scripting via fs_request_getUpdated 21 Oct 2024
- Freemius SDK <= 2.2.3 - Missing Authorization to Arbitrary Options UpdateUpdated 22 Jan 2024
- Stop User Enumeration <= 1.3.7 - Cross-Site ScriptingUpdated 22 Jan 2024
- Stop User Enumeration <= 1.3.4 - Username Enumeration BypassesUpdated 22 Jan 2024