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CVE-2023-5560

MEDIUM 6.1 CVSS 3.1
Published
November 27, 2023
Last modified
June 17, 2026
NVD status
Modified
Reported by
contact@wpscan.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Affected WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • Unknown WP-UserOnline — Before 2.88.3
  • lesterchan wp-useronline — Before 2.88.3

References

  • wpscan.com https://wpscan.com/vulnerability/55d23184-fc5a-4090-b079-142407b59b05 Exploit, Third Party Advisory
  • nvd.nist.gov Official NVD record