{"id":"CVE-2026-27061","kind":"vulnerability","aliases":["CVE-2026-27061"],"related":[],"title":"WordPress User Registration plugin: subscriber stored XSS up to 5.3.0","description":"Subscriber Cross Site Scripting (XSS) in User Registration <= 5.3.0 versions.","summary":"The User Registration WordPress plugin up to version 5.3.0 has a cross-site scripting flaw that a subscriber-level account can exploit. An attacker can plant script that runs in the browser of other users, such as administrators who view the injected content.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","user-registration-plugin","wordpress"],"not_affected_if":["newer-version","plugin-not-installed","registration-closed"],"how_to_check":"- Check the installed version of the User Registration plugin in the WordPress admin under Plugins, or with `wp plugin get user-registration --field=version`\n- Compare the result against 5.3.0; anything at or below that is in the stated range","fix":"- User Registration plugin: fixed version unknown (sources state only the affected range, up to and including `5.3.0`)","status":"open","published_at":"2026-10-30T19:18:23+00:00","first_seen_at":"2026-10-30T19:25:29+00:00","triaged_at":"2026-10-30T19:26:19+00:00","updated_at":"2026-10-30T19:26:19+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-10-30T19:26:19Z","model":"claude-haiku-5-5","output":{"fix":"- User Registration plugin: fixed version unknown (sources state only the affected range, up to and including `5.3.0`)","reach":"internet","title":"WordPress User Registration plugin: subscriber stored XSS up to 5.3.0","impact":"medium","summary":"The User Registration WordPress plugin up to version 5.3.0 has a cross-site scripting flaw that a subscriber-level account can exploit. An attacker can plant script that runs in the browser of other users, such as administrators who view the injected content.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","user-registration-plugin"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"Scripts run in other users' browsers, possibly administrators, to hijack sessions","analyst_note":"Confirm the fixed version and the vulnerable input field from the NVD entry or the plugin's changelog at https://nvd.nist.gov/vuln/detail/CVE-2026-27061.","how_to_check":"- Check the installed version of the User Registration plugin in the WordPress admin under Plugins, or with `wp plugin get user-registration --field=version`\n- Compare the result against 5.3.0; anything at or below that is in the stated range","plain_action":"","needs_analyst":true,"not_affected_if":["plugin-not-installed","newer-version","registration-closed"],"who_is_affected":"Sites running the User Registration plugin at version 5.3.0 or older are in the stated range. The attack needs a registered subscriber account on the site, so sites with open registration are the most exposed. Sites without this plugin or running a newer version are not affected.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000712,"input_tokens":4059,"output_tokens":613,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-27061':13A,16A '5.3.0':10A,31B,76C 'account':44B 'administr':62B 'attack':48B 'browser':56B 'content':67B 'cross':35B,69C 'cross-sit':34B 'cve':11A,14A 'exploit':46B 'flaw':38B 'inject':66B 'level':43B 'packag':17B 'plant':50B 'plugin':4A,21B,27B 'registr':3A,20B,25B,75C 'run':53B 'script':37B,51B,71C 'site':36B,70C 'store':6A 'subscrib':5A,42B,68C 'subscriber-level':41B 'user':2A,19B,24B,59B,74C 'user-registration-plugin':18B 'version':30B,77C 'view':64B 'wordpress':1A,22B,26B 'xss':7A,72C","nicknames":[],"mitigations":[],"who_affected":"Sites running the User Registration plugin at version 5.3.0 or older are in the stated range. The attack needs a registered subscriber account on the site, so sites with open registration are the most exposed. Sites without this plugin or running a newer version are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"first_public_at":"2026-10-30T19:18:23+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L","cvss_by":"audit@patchstack.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-27061","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27061","severity":null,"published_at":"2026-10-30T19:18:23+00:00","modified_at":"2026-10-30T19:22:27+00:00","first_seen_at":"2026-10-30T19:25:29+00:00","fetched_at":"2026-10-30T19:25:29+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"}