Authenticated Stored Cross-Site Scripting (XSS) in Simple Event Planner plugin <= 1.5.4 allows attackers with contributor or higher user roles to inject the malicious script by using vulnerable parameter &custom[add_seg][].
https://wordpress.org/plugins/simple-event-planner/#developers
https://patchstack.com/database/vulnerability/simple-event-planner/wordpress-simple-event-planner-plugin-1-5-4-authenticated-stored-cross-site-scripting-xss-vulnerability
Source: Mitre, NVD
Published: 2022-03-25
Updated: 2026-06-17
Base Score: 3.5
Vector: CVSS2#AV:N/AC:M/Au:S/C:N/I:P/A:N
Severity: Low
Base Score: 5.4
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Severity: Medium
EPSS: 0.00055