{"id":"CVE-2026-110590","kind":"vulnerability","aliases":["CVE-2026-110590"],"related":[],"title":"Klarna for WooCommerce: unauthenticated access to all order PII and keys","description":"The Klarna for WooCommerce plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.13.3 This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to access any order's secret order_key and full billing and shipping PII — including first name, last name, email address, phone number, street address, postcode, city, region, and country — emitted inline as the klarna_payments_params JavaScript variable, enabling full store-wide order enumeration. Because WooCommerce order IDs are sequential integers and no order_key or authenticated session is required, every order in the store can be trivially enumerated with sequential GET requests to the order-pay endpoint.","summary":"The Klarna for WooCommerce WordPress plugin, up to and including 4.13.3, fails to check authorization on the order-pay page. An unauthenticated attacker can read any order's secret order_key and full billing and shipping personal data, including names, emails, phone numbers and addresses.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["klarna","package","self-hosted","woocommerce","wordpress"],"not_affected_if":["fixed-version","plugin-not-installed"],"how_to_check":"- Check the installed version of the Klarna for WooCommerce plugin in the WordPress admin under Plugins; `4.13.3` or earlier is affected\n- unknown","fix":"- Update the Klarna for WooCommerce plugin to a version later than `4.13.3`, as published by the vendor\n- unknown","status":"open","published_at":"2026-10-16T05:17:29+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","triaged_at":"2026-10-25T03:25:12+00:00","updated_at":"2026-10-25T03:25:12+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T03:25:12Z","model":"claude-haiku-5-5","output":{"fix":"- Update the Klarna for WooCommerce plugin to a version later than `4.13.3`, as published by the vendor\n- unknown","reach":"internet","title":"Klarna for WooCommerce: unauthenticated access to all order PII and keys","impact":"high","summary":"The Klarna for WooCommerce WordPress plugin, up to and including 4.13.3, fails to check authorization on the order-pay page. An unauthenticated attacker can read any order's secret order_key and full billing and shipping personal data, including names, emails, phone numbers and addresses.","category":"package","nicknames":[],"who_cares":["wordpress","woocommerce","klarna","self-hosted"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker enumerates all store orders and reads customers' personal data","analyst_note":"Confirm the patched version number and whether a fix has shipped, using the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-110590 and the plugin's changelog.","how_to_check":"- Check the installed version of the Klarna for WooCommerce plugin in the WordPress admin under Plugins; `4.13.3` or earlier is affected\n- unknown","needs_analyst":true,"not_affected_if":["plugin-not-installed","fixed-version"],"who_is_affected":"Stores running WordPress with WooCommerce and the Klarna for WooCommerce plugin at version 4.13.3 or earlier are exposed, because the order-pay endpoint is reachable without login and order IDs are sequential. Stores that do not use this plugin, or that run a fixed later version, can skip it.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000648,"input_tokens":3465,"output_tokens":602,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-110590':14A,17A '-2026':13A,16A '4.13.3':35B,90C 'access':5A,117C 'action':108C 'address':70B,136C,140C 'attack':48B,115C 'authent':174C 'author':39B,81C,104C 'bill':59B,126C 'bypass':82C 'check':38B 'citi':142C 'countri':145C 'cve':12A,15A 'data':63B 'due':93C 'email':66B,135C 'emit':146C 'enabl':155C 'endpoint':196C 'enumer':161C,186C 'everi':178C 'fail':36B 'first':131C 'full':58B,125C,156C 'get':189C 'host':22B 'id':165C 'includ':34B,64B,89C,130C 'inlin':147C 'integ':168C 'javascript':153C 'key':11A,56B,123C,172C 'klarna':1A,18B,26B,72C,150C 'last':133C 'make':110C 'name':65B,132C,134C 'number':68B,138C 'order':8A,43B,52B,55B,119C,122C,160C,164C,171C,179C,194C 'order-pay':42B,193C 'packag':19B 'page':45B 'param':152C 'pay':44B,195C 'payment':151C 'perform':106C 'person':62B 'phone':67B,137C 'pii':9A,129C 'plugin':30B,75C,96C 'possibl':112C 'postcod':141C 'proper':98C 'read':50B 'region':143C 'request':190C 'requir':177C 'secret':54B,121C 'self':21B 'self-host':20B 'sequenti':167C,188C 'session':175C 'ship':61B,128C 'store':158C,182C 'store-wid':157C 'street':139C 'trivial':185C 'unauthent':4A,47B,114C 'user':102C 'variabl':154C 'verifi':99C 'version':85C 'vulner':79C 'wide':159C 'woocommerc':3A,23B,28B,74C,163C 'wordpress':24B,29B,77C","nicknames":[],"mitigations":[],"who_affected":"Stores running WordPress with WooCommerce and the Klarna for WooCommerce plugin at version 4.13.3 or earlier are exposed, because the order-pay endpoint is reachable without login and order IDs are sequential. Stores that do not use this plugin, or that run a fixed later version, can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T05:17:29+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_by":"security@wordfence.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-110590","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110590","severity":null,"published_at":"2026-10-16T05:17:29+00:00","modified_at":"2026-10-16T15:17:11+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","fetched_at":"2026-10-23T22:28:55+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"}