CVE-2026-4281 json
FormLift for Infusionsoft Web Forms <= 7.5.21 - Missing Authorization to Unauthenticated Infusionsoft Connection Hijack via OAuth Connection Flow
published 7mo ago modified 4mo ago also EUVD-2026-16100
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
Summary
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.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- trainingbusinesspros FormLift for Infusionsoft Web Forms
Classification
- Weakness
-
- CWE-862 Missing Authorization
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/a65cc674-a0ea-46b9-b609-b184e1f7ca8e?source=cve
- plugins.trac.wordpress.org /browser/formlift/trunk/modules/api/infusionsoft-manager.php#L64
- plugins.trac.wordpress.org /browser/formlift/tags/7.5.21/modules/api/infusionsoft-manager.php#L64
- plugins.trac.wordpress.org /browser/formlift/trunk/modules/api/infusionsoft-manager.php#L62
- plugins.trac.wordpress.org /browser/formlift/tags/7.5.21/modules/api/infusionsoft-manager.php#L62
- plugins.trac.wordpress.org /browser/formlift/trunk/modules/api/infusionsoft-manager.php#L21
- plugins.trac.wordpress.org /browser/formlift/tags/7.5.21/modules/api/infusionsoft-manager.php#L21
- plugins.trac.wordpress.org /browser/formlift/trunk/modules/api/infusionsoft-manager.php#L46
- plugins.trac.wordpress.org /browser/formlift/tags/7.5.21/modules/api/infusionsoft-manager.php#L46
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&old=3490212%40formlift&new=3490212%40formlift&sfp_email=&sfph_mail=
Sources
- CVE List CVE-2026-4281
- NVD CVE-2026-4281
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.