CVE-2023-5560

WP-UserOnline < 2.88.3 - Unauthenticated Stored XSS

Severity Score

6.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The WP-UserOnline WordPress plugin before 2.88.3 does not sanitise and escape the X-Forwarded-For header before outputting its content on the page, which allows unauthenticated users to perform Cross-Site Scripting attacks.

El complemento WP-UserOnline de WordPress anterior a 2.88.3 no sanitiza ni escapa del encabezado X-Forwarded-For antes de mostrar su contenido en la página, lo que permite a usuarios no autenticados realizar ataques de Cross Site Scripting.

The WP-UserOnline plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'X-Forwarded-For' header in all versions up to, and including, 2.88.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

*Credits: Krzysztof Zając (CERT PL), WPScan

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-10-12 CVE Reserved
2023-11-06 CVE Published
2024-08-02 CVE Updated
2024-08-02 First Exploit
2024-10-27 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://wpscan.com/vulnerability/55d23184-fc5a-4090-b079-142407b59b05	2024-08-02

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Lesterchan Search vendor "Lesterchan"		Wp-useronline Search vendor "Lesterchan" for product "Wp-useronline"				< 2.88.3 Search vendor "Lesterchan" for product "Wp-useronline" and version " < 2.88.3"		wordpress		Affected