TI-2023-00829 Aliases CVE-2023-0874 GHSA-6rcr-6w3p-5xj6

Klaviyo <= 3.0.10 - Admin+ Stored XSS

MEDIUM 55Published 2023-04-10 · Updated 2025-02-11

Key facts

Attack vector: Network
Privileges required: High
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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).

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00442 38th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix Fixed Klaviyo (Unknown): 3.0.10

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Unknown	Klaviyo	before 3.0.10	3.0.10	Patch available	CNA

Klaviyo VendorUnknown Affected before 3.0.10 Fixed in 3.0.10 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:klaviyo:klavio::::::wordpress::*	before 3.0.10	Vulnerable	Klaviyo, Inc.

cpe:2.3:a:klaviyo:klavio:*:*:*:*:*:wordpress:*:* Versions before 3.0.10 Vulnerable ·Klaviyo, Inc.

Remediation

Fix · CNA Klaviyo (Unknown) Fixed in 3.0.10

Timeline

2026-10-02 Threatist record created from CVE-2023-0874
2026-10-03 Alias added: GHSA-6rcr-6w3p-5xj6

References

Exploit 1

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

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences