Executive Intelligence Brief

The DoLogin Security plugin for WordPress is vulnerable to a critical authentication bypass vulnerability, CVE-2026-14495, with a CVSS score of 8.8. This vulnerability exists due to insufficient randomness in the generation of passwordless login tokens. An unauthenticated attacker can exploit this vulnerability to authenticate as any user, including administrators, without a password. The vulnerability affects all versions up to and including 4.3 of the plugin. Immediate patching to version 4.4 or later is strongly recommended.

Threat Overview

The DoLogin Security plugin for WordPress is a popular security plugin designed to enhance the security of WordPress installations. It provides features such as login protection and passwordless login functionality. However, a critical vulnerability in the plugin's passwordless login feature allows attackers to bypass authentication and gain unauthorized access to WordPress accounts.

The vulnerability exists because the `dologin\s::rrand()` function seeds the Mersenne Twister with a limited range of values, approximately 10^6, which is about 20 bits of entropy. This limited seed space can be brute-forced by an attacker, allowing them to reconstruct active passwordless login tokens.

Technical Deep Dive

Vulnerability Classification

The vulnerability is classified as CWE-338, Insufficient Randomness. This type of vulnerability occurs when a random number generator produces a limited range of values, making it predictable and vulnerable to brute-force attacks.

Root Cause Analysis

The root cause of the vulnerability is the use of a weak random number generator to seed the Mersenne Twister. The `mt_srand((double) microtime() * 1000000)` function discards the integer-seconds component of `microtime()` and constrains the seed to a limited range of approximately 10^6 values. This limited seed space makes it possible for an attacker to brute-force the seed and reconstruct active passwordless login tokens.

Attack Vector & Chain

The attack vector involves an unauthenticated attacker sending a request to the WordPress installation with a crafted `?dologin=.` parameter. The attacker can then brute-force the limited seed space to reconstruct an active passwordless login token and authenticate as any targeted user, including administrators, without a password.

Exploitation Scenario Walkthrough

Scenario: Authentication Bypass via Brute-Force Attack

Reconnaissance: An attacker discovers a WordPress installation with the DoLogin Security plugin installed and identifies a valid, unexpired passwordless login link for a target account.

Weaponization: The attacker prepares a brute-force attack to target the limited seed space used to generate the passwordless login token.

Delivery & Exploitation: The attacker sends a request to the WordPress installation with a crafted `?dologin=.` parameter and brute-forces the limited seed space to reconstruct an active passwordless login token.

Post-Exploitation: Once the attacker has reconstructed a valid passwordless login token, they can authenticate as the targeted user, including administrators, without a password. The attacker can then perform actions as the targeted user, including accessing sensitive data and modifying settings.

Impact Realization: The final impact of the vulnerability is unauthorized access to WordPress accounts, potentially leading to data breaches, website defacement, and other malicious activities.

Exploitation in the Wild

The vulnerability is not currently being actively exploited in the wild. However, given the severity of the vulnerability and the potential for exploitation, it is essential to patch the vulnerability immediately.

Impact Analysis

Direct Impact

The direct impact of the vulnerability is unauthorized access to WordPress accounts, potentially leading to data breaches, website defacement, and other malicious activities. An attacker can authenticate as any targeted user, including administrators, without a password.

Downstream & Cascading Effects

The downstream and cascading effects of the vulnerability include potential data breaches, website defacement, and other malicious activities. The vulnerability can also lead to lateral movement within the WordPress installation and potentially to other connected systems.

Affected Products & Versions

The vulnerability affects all versions of the DoLogin Security plugin up to and including 4.3. The fixed version is 4.4 or later.

Detection & Threat Hunting

Indicators of Compromise

Indicators of compromise include:

  • Unusual login activity from unknown IP addresses
  • Suspicious requests to the WordPress installation with crafted `?dologin=.` parameters
  • Unauthorized access to sensitive data and settings

Detection Rules & Signatures

Detection rules and signatures include:

  • Monitoring login activity for unusual patterns
  • Detecting suspicious requests to the WordPress installation with crafted `?dologin=.` parameters
  • Identifying unauthorized access to sensitive data and settings

Threat Hunting Queries

Threat hunting queries include:

  • Searching for unusual login activity in WordPress logs
  • Identifying suspicious requests to the WordPress installation with crafted `?dologin=.` parameters
  • Monitoring for unauthorized access to sensitive data and settings

Remediation & Hardening

Immediate Actions (0-24 hours)

Immediate actions include:

  • Patching the DoLogin Security plugin to version 4.4 or later
  • Monitoring login activity for unusual patterns
  • Detecting suspicious requests to the WordPress installation with crafted `?dologin=.` parameters

Short-Term Hardening (1-7 days)

Short-term hardening includes:

  • Implementing additional security controls, such as two-factor authentication
  • Monitoring for unauthorized access to sensitive data and settings
  • Identifying and addressing potential vulnerabilities in other plugins and themes

Strategic Recommendations

Strategic recommendations include:

  • Regularly updating and patching plugins and themes
  • Implementing a robust security strategy, including monitoring and incident response
  • Conducting regular security audits and penetration testing

Analyst Assessment

The vulnerability is critical and requires immediate attention. Given the severity of the vulnerability and the potential for exploitation, it is essential to patch the vulnerability immediately. The likelihood of exploitation is high, and the potential impact is significant.

Sources

  • National Vulnerability Database (NVD)
  • Wordfence