CVE-2023-2437Known exploitationPublic exploitNetwork attack vector

Account takeover via unverified Facebook-login email

Published Nov 22, 2023 · Updated Apr 8, 2026

Authentication bypass in DeluxeThemes UserPro 5.1.1 and earlier allows remote attackers to access arbitrary WordPress accounts via Facebook login. The userpro_fbconnect AJAX handler accepts a request-supplied email without verifying it with Facebook, resolves the associated WordPress user, and calls userpro_auto_login. The endpoint permits unauthenticated requests; knowledge of a target account's email grants that account's privileges, including administrator access.

CVSS severity9.8
Critical
EPSS probability6.75%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in DeluxeThemes UserPro 5.1.1 and earlier allows remote attackers to access arbitrary WordPress accounts via Facebook login. The userpro_fbconnect AJAX handler accepts a request-supplied email without verifying it with Facebook, resolves the associated WordPress user, and calls userpro_auto_login. The endpoint permits unauthenticated requests; knowledge of a target account's email grants that account's privileges, including administrator access.

The record

CVE
CVE-2023-2437
Published
Nov 22, 2023
Updated
Apr 8, 2026
Vendor
DeluxeThemes
Product
UserPro
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=5.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

DeluxeThemes · UserProversion=0 <=5.1.1

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1NISTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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