CVE-2026-4281 | trainingbusinesspros FormLift for Infusionsoft Web Forms Plugin up to 7.5.21 on WordPress connect/listen_for_tokens authorization

VDB-353547 · CVE-2026-4281 · GCVE-0-2026-4281 TRAININGBUSINESSPROS FORMLIFT FOR INFUSIONSOFT WEB FORMS PLUGIN UP TO 7.5.21 ON WORDPRESS CONNECT/LISTEN_FOR_TOKENS AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.2 $0-$5k 1.91+ Summaryinfo A vulnerability was found in trainingbusinesspros FormLift for Infusionsoft Web Forms Plugin up to 7.5.21 on WordPress. It has been classified as critical. The impacted element is the function connect/listen_for_tokens. Performing a manipulation results in authorization. This vulnerability is reported as CVE-2026-4281. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended. Detailsinfo A vulnerability classified as critical has been found in trainingbusinesspros FormLift for Infusionsoft Web Forms Plugin up to 7.5.21 on WordPress. This affects the function connect/listen_for_tokens. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: The FormLift for Infusionsoft Web Forms plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 7.5.21. This is due to missing capability checks on the connect() and listen_for_tokens() methods of the FormLift_Infusionsoft_Manager class, both of which are hooked to 'plugins_loaded' and execute on every page load. The connect() function generates an OAuth connection password and leaks it in the redirect Location header without verifying the requesting user is authenticated or authorized. The listen_for_tokens() function only validates the temporary password but performs no user authentication before calling update_option() to save attacker-controlled OAuth tokens and app domain. This makes it possible for unauthenticated attackers to hijack the site's Infusionsoft connection by first triggering the OAuth flow to obtain the temporary password, then using that password to set arbitrary OAuth tokens and app domain via update_option(), effectively redirecting the plugin's API communication to an attacker-controlled server. The weakness was disclosed by Nabil Irawan. It is possible to read the advisory at wordfence.com. This vulnerability is uniquely identified as CVE-2026-4281 since 03/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 7.5.21 eliminates this vulnerability. Productinfo Type WordPress Plugin Vendor trainingbusinesspros Name FormLift for Infusionsoft Web Forms Plugin Version 7.5.0 7.5.1 7.5.2 7.5.3 7.5.4 7.5.5 7.5.6 7.5.7 7.5.8 7.5.9 7.5.10 7.5.11 7.5.12 7.5.13 7.5.14 7.5.15 7.5.16 7.5.17 7.5.18 7.5.19 7.5.20 7.5.21 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.2 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.3 CNA Vector (Wordfence): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authorization CWE: CWE-862 / CWE-863 / CWE-285 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: FormLift for Infusionsoft Web Forms Plugin 7.5.21 Timelineinfo 03/16/2026 CVE reserved 03/26/2026 +10 days Advisory disclosed 03/26/2026 +0 days VulDB entry created 03/26/2026 +0 days VulDB entry last update Sourcesinfo Advisory: wordfence.com Researcher: Nabil Irawan Status: Confirmed CVE: CVE-2026-4281 (🔒) GCVE (CVE): GCVE-0-2026-4281 GCVE (VulDB): GCVE-100-353547 Entryinfo Created: 03/26/2026 07:01 Changes: 03/26/2026 07:01 (66) Complete: 🔍 Cache ID: 99:954:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸