CVE-2026-42663 MEDIUM

CVE-2026-42663: WordPress Simple Membership plugin <= 4.7.2 - Cross Site Scripting (XSS) vulnerability

Vendor Wp.insider

Product Simple Membership

Weakness CWE-79 · XSS

Published June 15, 2026

Last update June 15, 2026

View on NVD All CVEs

CVSS base score

6.5/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Unauthenticated Cross Site Scripting (XSS) in Simple Membership <= 4.7.2 versions.

Explanation of Vulnerability in Simple Terms

02Summary

Simple Membership versions up to 4.7.2 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. An attacker with low-level access can craft a request that executes JavaScript in other users' browsers, potentially stealing session tokens or performing actions on their behalf. The vulnerability requires user interaction—the victim must visit a page containing the attacker's payload.

What an attacker can do

03Attacker Capabilities

Inject and execute JavaScript in other users' browsers to steal data or perform actions as them.

Potential impact on your site

04Site Impact

Authenticated users can be compromised; attackers may steal admin sessions or modify site content via victim browsers.

Conditions required to exploit

05Prerequisites

Attacker must have a low-privilege account and the victim must visit a page with the attacker's malicious payload.

Key dates

06Disclosure timeline

June 15, 2026 CVE published

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-42663 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html AskarLabs — CWE-79 write-up Cross-Site Scripting

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