# CVE-2026-4281: Missing authorization in FormLift for Infusionsoft Web Forms

> Unauthenticated attackers can hijack the Infusionsoft connection by exploiting missing authorization checks in the OAuth flow, redirecting API traffic to attacker servers.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-5rfm-3pqq-3xm3

## What is CVE-2026-4281?

CVE-2026-4281 is a medium-severity missing authorization vulnerability in trainingbusinesspros FormLift for Infusionsoft Web Forms, published on 26 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-4281?


## How do I fix CVE-2026-4281?

No fix has been published for CVE-2026-4281 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4281 being exploited?

There is no known exploitation of CVE-2026-4281 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4281 and fix it if it is affected.

What it is: CVE-2026-4281 is a medium-severity missing authorization vulnerability in trainingbusinesspros FormLift for Infusionsoft Web Forms, published on 26 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4281 in the wild and no public exploit code.

Affected product: trainingbusinesspros FormLift for Infusionsoft Web Forms. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4281/ (Markdown: https://insights.sbomify.com/CVE-2026-4281/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4281
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4281
- OSV: https://osv.dev/vulnerability/CVE-2026-4281

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-4281/
Summaries are generated and may contain mistakes; the official description above is the record.