{"id":"CVE-2023-5560","aliases":["EUVD-2023-57860","GHSA-3v9m-2r3c-48wc"],"status":"published","title":"WP-UserOnline \u003c 2.88.3 - Unauthenticated Stored XSS","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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.0051,"percentile":0.43785,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2023-11-27T16:22:00Z","modified":"2026-06-17T06:48:50Z","products":[{"vendor":"lesterchan","product":"wp-useronline"},{"vendor":"unknown","product":"wp-useronline"}],"references":[{"url":"https://wpscan.com/vulnerability/55d23184-fc5a-4090-b079-142407b59b05","tags":["exploit","vdb-entry","technical-description","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-5560"},{"url":"https://github.com/advisories/GHSA-3v9m-2r3c-48wc"}],"sources":{"cve":[{"id":"CVE-2023-5560","title":"WP-UserOnline \u003c 2.88.3 - Unauthenticated Stored XSS","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.","status":"published","published":"2023-11-27T16:22:00.142Z","modified":"2024-11-21T19:17:14.77Z","updated_at":"2026-11-02T14:35:16.771348Z"}],"euvd":[{"id":"EUVD-2023-57860","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.","status":"published","published":"2023-11-27T16:22:00Z","modified":"2024-11-21T19:17:14Z","cvss":[{"version":"","score":0,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"none"}],"updated_at":"2026-11-03T00:04:52.116962Z"}],"ghsa":[{"id":"GHSA-3v9m-2r3c-48wc","title":"The WP-UserOnline WordPress plugin before 2.88.3 does not sanitise and escape the X-Forwarded-For...","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.","status":"published","published":"2023-11-27T18:31:14Z","modified":"2023-12-09T05:05:15Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:55:10.314842Z"}],"nvd":[{"id":"CVE-2023-5560","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.","status":"published","published":"2023-11-27T17:15:08.98Z","modified":"2026-06-17T06:48:50.57Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:08:49.393375Z"}]}}