Detections
Analytics

WordPress XSS2Shell 4.7.0 < 4.7.34 / 4.8.0 < 4.8.29 / 4.9.0 < 4.9.30 / 5.0.0 < 5.0.26 / 5.1.0 < 5.1.23 / 5.2.0 < 5.2.25 / 5.3.0 < 5.3.22 / 5.4.0 < 5.4.20 / 5.5.0 < 5.5.19 / 5.6.0 < 5.6.18 / 5.7.0 < 5.7.16 / 5.8.0 < 5.8.14 / 5.9.0 < 5.9.14 / 6.0.0 < 6.0.13 / 6.1.0 < 6.1.11 / 6.2.0 < 6.2.10 / 6.3.0 < 6.3.9 / 6.4.0 < 6.4.9 / 6.5.0 < 6.5.9 / 6.6.0 < 6.6.6 / 6.7.0 < 6.7.6 / 6.8.0 < 6.8.7 / 6.9.0 < 6.9.6 / 7.0.0 < 7.0.3 Login Screen XSS

high Nessus Plugin ID 334528

Synopsis

A PHP application running on the remote web server is affected by a cross-site scripting vulnerability.

Description

The version of WordPress installed on the remote host is 4.7.x prior to 4.7.34, or 4.8.x prior to 4.8.29, or 4.9.x prior to 4.9.30, or 5.0.x prior to 5.0.26, or 5.1.x prior to 5.1.23, or 5.2.x prior to 5.2.25, or 5.3.x prior to 5.3.22, or 5.4.x prior to 5.4.20, or 5.5.x prior to 5.5.19, or 5.6.x prior to 5.6.18, or 5.7.x prior to 5.7.16, or 5.8.x prior to 5.8.14, or 5.9.x prior to 5.9.14, or 6.0.x prior to 6.0.13, or 6.1.x prior to 6.1.11, or 6.2.x prior to 6.2.10, or 6.3.x prior to 6.3.9, or 6.4.x prior to 6.4.9, or 6.5.x prior to 6.5.9, or 6.6.x prior to 6.6.6, or 6.7.x prior to 6.7.6, or 6.8.x prior to 6.8.7, or 6.9.x prior to 6.9.6, or 7.0.x prior to 7.0.3. It is, therefore, affected by a vulnerability.

 - WordPress is vulnerable to a pre-auth reflected XSS vulnerability on the login screen. Via a specially crafted malicious third-party website hosted by an attacker, it is possible for this to be escalated to an RCE vulnerability with conditions outside of the attackers control. This requires successful social engineering of and explicit interaction by the target victim. (CVE-2026-64638)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to WordPress version 4.7.34 / 4.8.29 / 4.9.30 / 5.0.26 / 5.1.23 / 5.2.25 / 5.3.22 / 5.4.20 / 5.5.19 / 5.6.18 / 5.7.16 / 5.8.14 / 5.9.14 / 6.0.13 / 6.1.11 / 6.2.10 / 6.3.9 / 6.4.9 / 6.5.9 / 6.6.6 / 6.7.6 / 6.8.7 / 6.9.6 / 7.0.3 or later.

See Also

https://pwn.ai/blog/xss2shell

https://wordpress.org/news/2026/08/wordpress-7-0-3-release/

http://www.nessus.org/u?a83b6f0b

Plugin Details

Severity: High

ID: 334528

File Name: wordpress_CVE-2026-64638.nasl

Version: 1.1

Type: Remote

Family: CGI abuses

Published: 8/11/2026

Updated: 8/11/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Enable CGI Scanning: true

Risk Information

VPR

Risk Factor: Medium

Score: 5.3

Percentile: 96.23

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-64638

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v4

Risk Factor: High

Base Score: 8.9

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Vulnerability Information

CPE: cpe:/a:wordpress:wordpress

Required KB Items: installed_sw/WordPress, www/PHP, Settings/ParanoidReport

Patch Publication Date: 8/6/2026

Vulnerability Publication Date: 8/6/2026

Reference Information

CVE: CVE-2026-64638

CWE: 79