CVE-2023-0873: Kanban Boards for WordPress < 2.5.21 - Admin+ Stored XSS

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-06-27 · updated 2026-06-17

Description

The Kanban Boards for WordPress plugin before 2.5.21 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)

Affected products

Kanban for WordPress Kanban Boards for WordPress: before 2.5.21 — fixed in 2.5.21

How to fix

Upgrade to a fixed version: Kanban for WordPress Kanban Boards for WordPress 2.5.21. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/8816d4c1-9e8e-4b6f-a36a-10a98a7ccfcd
https://wpscan.com/vulnerability/8816d4c1-9e8e-4b6f-a36a-10a98a7ccfcd

Get alerted when CVE-2023-0873 or the next vulnerability affects your stack