Vulnerabilities / WP User Merger / WPSEC-2026-2377
WP User Merger <= 1.6.5 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Display Name
Medium 5.4
CWE-79Fixed in 1.6.6
- ID
- WPSEC-2026-2377
- Plugin
- WP User Merger (wp-user-merger)
- Affected
- all versions before 1.6.6
- Remediation
- Update to 1.6.6 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions None seen among sites WPSec scans, 2026-11-03
- Attack surface
- WP User Merger on WPSec AttackSurface
- Fix released
- Published
Description
The WP User Merger plugin for WordPress is vulnerable to Stored Cross-Site Scripting via a user's display name on the plugin's merge page in all versions up to, and including, 1.6.5 due to insufficient output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject web scripts into their profile that execute if an administrator selects that user for a merge and performs a further action on the page.
References
- https://wpsec.com/vuln/WPSEC-2026-2377/
- https://plugins.svn.wordpress.org/wp-user-merger/tags/1.6.6/
- https://wordpress.org/plugins/wp-user-merger/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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