CVE-2023-2027Network attack vector

Account takeover via unverified Facebook identity

Published Apr 15, 2023 · Updated Apr 8, 2026

Authentication bypass in ZM Ajax Login & Register 2.0.2 and earlier allows remote attackers to access any existing WordPress account. The unauthenticated facebook_login AJAX handler trusts a client-supplied Facebook ID as a WordPress username and calls wp_set_auth_cookie for the matching user without validating a Facebook token. Facebook login must be enabled, and knowledge of a target username is enough to obtain that account's privileges, including Administrator access.

CVSS severity9.8
Critical
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in ZM Ajax Login & Register 2.0.2 and earlier allows remote attackers to access any existing WordPress account. The unauthenticated facebook_login AJAX handler trusts a client-supplied Facebook ID as a WordPress username and calls wp_set_auth_cookie for the matching user without validating a Facebook token. Facebook login must be enabled, and knowledge of a target username is enough to obtain that account's privileges, including Administrator access.

The record

CVE
CVE-2023-2027
Published
Apr 15, 2023
Updated
Apr 8, 2026
Vendor
Zane Matthew
Product
ZM Ajax Login & Register
Classifications
CWE-288, CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 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 <=2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zane Matthew · ZM Ajax Login & Registerversion=0 <=2.0.2

Published CVSS scores

9.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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