{"id":"CVE-2026-116866","kind":"vulnerability","aliases":["CVE-2026-116866"],"related":[],"title":"WooCommerce Extra Fees plugin: PHP object injection lets contributors run code","description":"Contributor PHP Object Injection in Extra Fees Plugin for WooCommerce <= 4.4.0 versions.","summary":"The Extra Fees plugin for WooCommerce, versions 4.4.0 and older, unserializes untrusted PHP object data. An attacker with contributor-level access can use this to inject objects that may lead to code execution on the store.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","php","woocommerce","wordpress"],"not_affected_if":["plugin-not-installed","plugin-updated-past-4.4.0"],"how_to_check":"- Look up the installed Extra Fees for WooCommerce plugin version in the WordPress admin under Plugins.\n- Confirm whether the plugin is active on the site.","fix":"- Extra Fees for WooCommerce: move to a version newer than `4.4.0` (the sources do not name the fixed release).","status":"open","published_at":"2026-10-29T16:18:01+00:00","first_seen_at":"2026-10-29T16:25:57+00:00","triaged_at":"2026-10-29T16:29:12+00:00","updated_at":"2026-10-29T16:29:12+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-10-29T16:29:12Z","model":"claude-haiku-5-5","output":{"fix":"- Extra Fees for WooCommerce: move to a version newer than `4.4.0` (the sources do not name the fixed release).","reach":"internet","title":"WooCommerce Extra Fees plugin: PHP object injection lets contributors run code","impact":"high","summary":"The Extra Fees plugin for WooCommerce, versions 4.4.0 and older, unserializes untrusted PHP object data. An attacker with contributor-level access can use this to inject objects that may lead to code execution on the store.","audience":"businesses","category":"package","nicknames":[],"who_cares":["woocommerce","wordpress","php"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"Attacker runs code on the store server via injected objects","analyst_note":"Confirm the fixed version and the CVSS vector at https://nvd.nist.gov/vuln/detail/CVE-2026-116866; sources give only the 4.4.0 cutoff.","how_to_check":"- Look up the installed Extra Fees for WooCommerce plugin version 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","plugin-updated-past-4.4.0"],"who_is_affected":"Sites running the Extra Fees for WooCommerce plugin at version 4.4.0 or older. The flaw needs an account with contributor-level access, so exposure depends on who holds such accounts. The sources do not say whether default configurations are affected.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000699,"input_tokens":4070,"output_tokens":584,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-116866':14A,17A '-2026':13A,16A '4.4.0':29B,69C 'access':43B 'attack':38B 'code':11A,54B 'contributor':9A,41B,59C 'contributor-level':40B 'cve':12A,15A 'data':36B 'execut':55B 'extra':2A,23B,64C 'fee':3A,24B,65C 'inject':7A,48B,62C 'lead':52B 'let':8A 'level':42B 'may':51B 'object':6A,35B,49B,61C 'older':31B 'packag':18B 'php':5A,19B,34B,60C 'plugin':4A,25B,66C 'run':10A 'store':58B 'unseri':32B 'untrust':33B 'use':45B 'version':28B,70C 'woocommerc':1A,20B,27B,68C 'wordpress':21B","nicknames":[],"mitigations":[],"who_affected":"Sites running the Extra Fees for WooCommerce plugin at version 4.4.0 or older. The flaw needs an account with contributor-level access, so exposure depends on who holds such accounts. The sources do not say whether default configurations are affected.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T16:18:01+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"audit@patchstack.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-116866","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116866","severity":null,"published_at":"2026-10-29T16:18:01+00:00","modified_at":"2026-10-29T16:20:19+00:00","first_seen_at":"2026-10-29T16:25:57+00:00","fetched_at":"2026-10-29T16:25:57+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"}