CVE-2023-0874: Klaviyo Klavio

Medium severity, CVSS 4.8. EPSS: 0.4% chance of exploitation in the next 30 days.

The Klaviyo WordPress plugin before 3.0.10 does not sanitize 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

• Klaviyo Klavio: before 3.0.10 (fixed in 3.0.10)

Published 2023-04-10. Last modified 2026-06-17.