Fluent Forms Pro subscriber object injection can reset user passwords
Fluent Forms Pro Add On Pack through 6.2.6 deserializes attacker-controlled form data when the User Update integration is enabled and a user-meta field is mapped. A logged-in Subscriber can submit a serialized PHP object; when a suitable POP chain is present, processing the mapped meta value can change another user's password and potentially take over an administrator account. The CNA record and vendor changelog do not disclose the exact endpoint, action, parameter or PHP function involved.
- Component
- Fluent Forms Pro Add On Pack
- Plugin slug
fluent-forms-pro-add-on-pack- Affected
- <= 6.2.6
- Safe version
6.2.7- Published
- Jul 26, 2026
This CVE was published Jul 26, 2026 and is one of 4 known issues for this plugin.
Update, patch or deactivate.
Update Fluent Forms Pro Add On Pack to 6.2.7 or later. Until patched, disable the User Update integration or remove user-meta mappings. Review unexpected credential changes and administrator access if a vulnerable configuration was exposed.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Fluent Forms Pro Add On Pack plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 6.2.6 via deserialization of untrusted input. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject a PHP Object. The additional presence of a POP chain allows attackers to change user passwords and potentially take over administrator accounts. Note: This can only be exploited if user update integration is enabled and a user meta field is mapped.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H