What’s Vulnerable › Vulnerabilities

CVE-2023-0874: Klaviyo <= 3.0.10 - Admin+ Stored XSS

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-04-10 · updated 2026-06-17

Description

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

How to fix

Upgrade to a fixed version: Klaviyo Klavio 3.0.10. Check the vendor advisory for mitigations.

References

• https://wpscan.com/vulnerability/495e39db-793d-454b-9ef1-dd91cae2c49b
• https://wpscan.com/vulnerability/495e39db-793d-454b-9ef1-dd91cae2c49b

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