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CVE-2023-5560: wp-useronline vulnerability
CVE-2023-5560: medium vulnerability affecting wp-useronline. Check CVSS, KEV status, business impact and recommended administrator actions.
- CVSS
- 6.1 MEDIUM
- EPSS
- 40.48%
- Known exploited
- not in KEV
- Product
- wp-useronline
What is known
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.
Business impact
Successful exploitation of CVE-2023-5560, a medium vulnerability (CVSS 6.1) affecting wp-useronline, may affect the confidentiality, integrity or availability of the vulnerable environment. The exact impact depends on the installed version, exposed interfaces and deployment configuration.
Recommended administrator action
Confirm whether wp-useronline is present and compare installed versions with the vendor advisory and NVD record. Apply the vendor patch or documented mitigation; until remediation is complete, reduce exposure of affected interfaces, review relevant logs and monitor for indicators of exploitation. DataHouse can support version verification, managed patching, network exposure reduction, log review and backup validation for dedicated, cloud and colocated environments.