{"id":"CVE-2026-66570","kind":"vulnerability","aliases":["CVE-2026-66570"],"related":[],"title":"WordPress File Upload plugin: stored XSS through version 5.2.1","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Nickboss WordPress File Upload wp-file-upload allows Stored XSS.This issue affects WordPress File Upload: from n/a through 5.2.1.","summary":"The wp-file-upload WordPress plugin by Nickboss has a stored cross-site scripting flaw in versions up to 5.2.1. An attacker who can get script stored in the site can run it in other visitors' browsers, including administrators.","severity":"high","cvss":7.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","wordpress","wp-file-upload"],"not_affected_if":["plugin-not-installed"],"how_to_check":"- Check the installed version of WP File Upload (wp-file-upload) in the WordPress admin under Plugins.\n- Confirm whether the plugin is active on the site.","fix":"- WordPress File Upload: versions after `5.2.1` (the sources do not name a specific fixed version).","status":"open","published_at":"2026-11-01T16:18:15+00:00","first_seen_at":"2026-11-01T16:20:46+00:00","triaged_at":"2026-11-01T16:22:41+00:00","updated_at":"2026-11-01T16:22:41+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-01T16:22:41Z","model":"claude-haiku-5-5","output":{"fix":"- WordPress File Upload: versions after `5.2.1` (the sources do not name a specific fixed version).","reach":"internet","title":"WordPress File Upload plugin: stored XSS through version 5.2.1","impact":"medium","summary":"The wp-file-upload WordPress plugin by Nickboss has a stored cross-site scripting flaw in versions up to 5.2.1. An attacker who can get script stored in the site can run it in other visitors' browsers, including administrators.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","wp-file-upload"],"confidence":0.6,"fix_status":"unknown","needs_auth":"unknown","worst_case":"attacker script runs in visitors' and admins' browsers","analyst_note":"Confirm the fixed version and whether low-privilege users can store the payload; check the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-66570.","how_to_check":"- Check the installed version of WP File Upload (wp-file-upload) in the WordPress admin under Plugins.\n- Confirm whether the plugin is active on the site.","plain_action":"","needs_analyst":true,"not_affected_if":["plugin-not-installed"],"who_is_affected":"Sites running the wp-file-upload WordPress plugin at version 5.2.1 or earlier are affected. Sites without the plugin, or running a newer version, can skip it. The sources do not say what configuration or account level is needed to store the script.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000692,"input_tokens":4122,"output_tokens":559,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':11A,14A '-66570':12A,15A '5.2.1':9A,43B,96C 'administr':62B 'affect':89C 'allow':85C 'attack':45B 'browser':60B 'cross':35B,72C 'cross-sit':34B,71C 'cve':10A,13A 'file':2A,20B,25B,79C,83C,91C 'flaw':38B 'generat':70C 'get':48B 'improp':63C 'includ':61B 'input':66C 'issu':88C 'n/a':94C 'neutral':64C 'nickboss':30B,77C 'packag':16B 'page':69C 'plugin':4A,28B 'run':55B 'script':37B,49B,74C 'site':36B,53B,73C 'store':5A,33B,50B,86C 'upload':3A,21B,26B,80C,84C,92C 'version':8A,40B 'visitor':59B 'vulner':75C 'web':68C 'wordpress':1A,17B,27B,78C,90C 'wp':19B,24B,82C 'wp-file-upload':18B,23B,81C 'xss':6A 'xss.this':87C","nicknames":[],"mitigations":[],"who_affected":"Sites running the wp-file-upload WordPress plugin at version 5.2.1 or earlier are affected. Sites without the plugin, or running a newer version, can skip it. The sources do not say what configuration or account level is needed to store the script.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"first_public_at":"2026-11-01T16:18:15+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","cvss_by":"audit@patchstack.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-66570","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66570","severity":null,"published_at":"2026-11-01T16:18:15+00:00","modified_at":"2026-11-01T16:18:15+00:00","first_seen_at":"2026-11-01T16:20:46+00:00","fetched_at":"2026-11-01T16:20:46+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}