What is the CVSS score of CVE-2026-4281?

CVE-2026-4281 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.2%.

Which versions of Formlift For Infusionsoft Web Forms are affected by CVE-2026-4281?

Organizations using for WordPress is vulnerable to Missing Authorization in all should be aware of moderate risk from CVE-2026-4281, a missing authorization vulnerability rated CVSS 5.3.

How to fix or mitigate CVE-2026-4281?

Within 30 days: Identify affected systems running for WordPress is vulnerable to Missing Authorization in all and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Formlift For Infusionsoft Web Forms CVE-2026-4281

EUVD-2026-16100 MEDIUM

Missing Authorization (CWE-862)

2026-03-26 Wordfence

WordPress Authentication Bypass Formlift For Infusionsoft Web Forms Wordpress Plugin Trainingbusinesspros

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

EUVD ID Assigned

Mar 26, 2026 - 04:30 euvd

EUVD-2026-16100

Analysis Generated

Mar 26, 2026 - 04:30 vuln.today

CVE Published

Mar 26, 2026 - 03:37 nvd

MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

The FormLift for Infusionsoft Web Forms WordPress plugin contains a missing authorization vulnerability (CWE-862) that allows unauthenticated attackers to hijack the site's Infusionsoft OAuth connection. Affected versions through 7.5.21 fail to validate user authentication on critical OAuth handler methods, enabling attackers to intercept temporary OAuth credentials and inject arbitrary OAuth tokens and app domains via the update_option() function. This is a network-accessible, low-complexity vulnerability with no required privileges; while the CVSS score is moderate (5.3), the real-world impact is integrity compromise of the CRM integration layer, potentially affecting customer data flows and automation.

Technical ContextAI

The FormLift for Infusionsoft Web Forms plugin (cpe:2.3:a:trainingbusinesspros:formlift_for_infusionsoft_web_forms:*:*:*:*:*:*:*:*) integrates WordPress sites with Infusionsoft's CRM platform via OAuth 2.0 authentication. The vulnerability exists in the FormLift_Infusionsoft_Manager class, specifically in two methods: connect() and listen_for_tokens(), both hooked to the 'plugins_loaded' action which executes on every page load. The connect() method initiates OAuth flow and exposes a temporary password in the HTTP Location redirect header without verifying the requester's identity. The listen_for_tokens() method accepts and persists OAuth tokens via WordPress's update_option() function with only temporary password validation-no user capability checks. The root cause falls under CWE-862 (Missing Authorization), a failure to implement access control on sensitive operations. This allows an attacker to manipulate WordPress site options that control Infusionsoft API routing and credentials, potentially redirecting API calls to attacker-controlled infrastructure.

RemediationAI

Upgrade the FormLift for Infusionsoft Web Forms plugin to version 7.5.22 or later, which should include capability checks (current_user_can()) on the connect() and listen_for_tokens() methods. Check the official plugin repository or vendor advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/a65cc674-a0ea-46b9-b609-b184e1f7ca8e for confirmation of the patched version. Until patching is possible, implement compensating controls: (1) restrict WordPress site access via IP whitelist or Web Application Firewall rules to block unauthenticated requests to the 'plugins_loaded' action if possible; (2) implement nonce verification and additional CSRF tokens on OAuth-related endpoints; (3) audit WordPress site options tables for unauthorized modifications to Infusionsoft connection settings (search for options prefixed with 'infusionsoft' or 'formlift'); (4) monitor Infusionsoft API logs for unexpected API calls from unknown IP ranges. Additionally, consider temporarily disabling the FormLift plugin until a patch is available if the Infusionsoft integration is not critical to operations.