CVE-2026-66640 MEDIUM

CVE-2026-66640: WordPress Login With Ajax plugin <= 4.5.1 - Cross Site Scripting (XSS) vulnerability

Vendor Marcus (Aka @Msykes)

Product Login With Ajax

Weakness CWE-79 · XSS

Published August 18, 2026

Last update August 18, 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

Contributor Cross Site Scripting (XSS) in Login With Ajax <= 4.5.1 versions.

Explanation of Vulnerability in Simple Terms

02Summary

Login With Ajax versions up to 4.5.1 contain a stored cross-site scripting (XSS) vulnerability. An authenticated user can inject malicious scripts that execute in other users' browsers when they view affected pages. The vulnerability requires user interaction and can affect the confidentiality, integrity, and availability of the site.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that run in other users' browsers and steal data or perform actions on their behalf.

Potential impact on your site

04Site Impact

Authenticated users can inject scripts affecting other visitors; attackers could steal admin credentials, deface content, or redirect users.

Conditions required to exploit

05Prerequisites

Attacker must be logged in with at least low-level privileges and trick a user into viewing a page containing the injected payload.

Key dates

06Disclosure timeline

August 18, 2026 CVE published

August 18, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-66640 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html AskarLabs — CWE-79 write-up Cross-Site Scripting

Related vulnerabilities

Identifiers

CVE CVE-2026-66640

CWE CWE-79

CVSS 6.5 / MEDIUM

Affected versions