CVE-2023-25456 MEDIUM

CVE-2023-25456: WordPress Klaviyo Plugin <= 3.0.7 is vulnerable to Cross Site Scripting (XSS)

Vendor Klaviyo, Inc.

Product Klaviyo

Weakness CWE-79 · XSS

Published March 23, 2023

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

5.9/10

Attack vector Network

Attack complexity Low

Privileges required High

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Klaviyo, Inc. Klaviyo plugin <= 3.0.7 versions.

Explanation of Vulnerability in Simple Terms

02Summary

Klaviyo versions up to 3.0.7 contain a cross-site scripting (XSS) vulnerability that allows an authenticated administrator to inject malicious scripts. The vulnerability requires user interaction—typically clicking a crafted link—and affects the integrity and confidentiality of site data. The impact extends beyond the vulnerable component due to scope change.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that execute in other users' browsers when they interact with affected pages.

Potential impact on your site

04Site Impact

An admin account could be compromised to steal session data or modify site content via injected scripts.

Conditions required to exploit

05Prerequisites

Attacker must have high-level admin privileges and the victim must click a malicious link or visit a crafted page.

Key dates

06Disclosure timeline

March 23, 2023 CVE published

April 28, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2023-25456 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html AskarLabs — CWE-79 write-up Cross-Site Scripting

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