CVE-2023-5560

Name: CVE-2023-5560
Creator: NVD / NIST
Published: 2023-11-27T17:15:08.98+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.51%

Last modified Jun 17, 2026

CVE-2023-5560 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.51%

39.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Lesterchan	Wp-Useronline	< 2.88.3

References

https://wpscan.com/vulnerability/55d23184-fc5a-4090-b079-142407b59b05Exploit, Third Party Advisory
https://wpscan.com/vulnerability/55d23184-fc5a-4090-b079-142407b59b05Exploit, Third Party Advisory

Timeline

Published: Nov 27, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-5560?

How severe is CVE-2023-5560?

CVE-2023-5560 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2023-5560?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-5560?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST