Is CVE-2026-3139 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-3139 being exploited in the wild.

How severe is CVE-2026-3139?

Medium severity, with a CVSS score of 4.3, published 31 March 2026.

Which products and versions are affected?

Cozmoslabs User Profile Builder <= 3.15.5.

Is there a fix for CVE-2026-3139?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-3139 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-3139?

Check whether you run Cozmoslabs User Profile Builder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-3139: Cozmoslabs User Profile Builder IDOR in wppb_save_avatar_value

Q: Is there a fix for CVE-2026-3139?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-3139 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-3139?

Check whether you run Cozmoslabs User Profile Builder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-3139 · Severity: medium · CVSS 4.3 · Published 2026-03-31

The User Profile Builder plugin for WordPress, which manages user registrations and profiles, contains a security flaw that allows logged-in users to change the ownership of website content. By exploiting this vulnerability, a standard user (such as a subscriber) could reassign posts or file attachments to themselves or others. This could lead to unauthorized modification of site content and disruption of administrative workflows.

Technologies: Cozmoslabs User Profile Builder. Vendors: Cozmoslabs.

Quick answers

Is CVE-2026-3139 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-3139 being exploited in the wild.
How severe is CVE-2026-3139?: Medium severity, with a CVSS score of 4.3, published 31 March 2026.
Which products and versions are affected?: Cozmoslabs User Profile Builder <= 3.15.5.
Is there a fix for CVE-2026-3139?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-3139 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-3139?: Check whether you run Cozmoslabs User Profile Builder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is classified as an Insecure Direct Object Reference (IDOR) within the wppb_save_avatar_value() function. The root cause is a lack of validation on a user-controlled key, specifically allowing the modification of the 'post_author' field. An authenticated attacker with at least subscriber-level permissions can exploit this over the network to reassign ownership of arbitrary posts and attachments. This bypasses intended authorization controls for content management. The issue is fixed in versions following 3.15.5.

Affected products

Cozmoslabs User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor <= 3.15.5

Timeline

2026-03-31: disclosed
2026-03-31: advisory

References

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