CVE-2026-4281
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe FormLift for Infusionsoft plugin lacks authorization checks on two critical methods (connect() and listen_for_tokens()) that execute on every page load via plugins_loaded. The connect() function leaks an OAuth temporary password in the redirect Location header to unauthenticated users, and listen_for_tokens() saves attacker-controlled OAuth tokens and app domain via update_option() without validating the requesting user, enabling full hijacking of the Infusionsoft API connection.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify FormLift for Infusionsoft plugin is installedNavigate to WordPress admin > Plugins and look for 'FormLift for Infusionsoft' in the installed plugins listAffected if The plugin is present and active in the WordPress installation
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Check the installed plugin versionIn WordPress admin > Plugins, find FormLift and note the version number displayed; alternatively, inspect the plugin main file header for the 'Version' tagAffected if The installed version has not been patched to include authorization checks on connect() and listen_for_tokens() methods
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Inspect the connect() method for missing authorizationLocate the plugin PHP files and search for the connect() function; examine whether it performs any user authentication verification or capability checks (e.g., manage_options) before setting the OAuth temporary password in the redirect Location headerAffected if The connect() method executes without checking if the user is authenticated or has appropriate privileges
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Inspect the listen_for_tokens() method for missing authorizationLocate the plugin PHP files and search for the listen_for_tokens() function; verify whether it validates user authentication or authorization before calling update_option() to save OAuth tokens and app domainAffected if The listen_for_tokens() method processes and saves OAuth tokens without validating the requesting user is authenticated
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Verify plugins_loaded hook execution contextCheck the plugin initialization code for hooks registered via add_action('plugins_loaded', ...) that call connect() or listen_for_tokens(); confirm these methods run on every page load regardless of user sessionAffected if The vulnerable methods are hooked to execute on every page load without authentication requirements
A user is affected if the FormLift for Infusionsoft plugin is installed with a version lacking authorization checks on the connect() and listen_for_tokens() methods, allowing unauthenticated access to OAuth token handling.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedAdd capability checks (e.g., manage_options) to both connect() and listen_for_tokens() methods, implement proper user authentication validation before processing OAuth tokens, and ensure the temporary password validation is paired with authenticated session verification.
7.5.22 or later
- 1. Navigate to the WordPress admin dashboard
- 2. Go to Plugins > Installed Plugins
- 3. Locate 'FormLift for Infusionsoft Web Forms'
- 4. If an update is available, click 'Update Now'
- 5. After updating, verify the plugin version is 7.5.22 or higher
- 6. Test that the Infusionsoft OAuth connection still functions correctly
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-4281 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-4281 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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