CVE-2023-2982: WordPress Social Login Auth Bypass Flaw

CVE-2023-2982 Overview

CVE-2023-2982 is a critical authentication bypass vulnerability affecting the WordPress Social Login and Register (Discord, Google, Twitter, LinkedIn) plugin by miniOrange. The vulnerability exists in versions up to and including 7.6.4, where insufficient encryption on user data during the social login validation process allows attackers to bypass authentication controls entirely.

This flaw enables unauthenticated attackers to log in as any existing user on a WordPress site, including administrators, simply by knowing the target user's email address. The vulnerability was partially addressed in version 7.6.4 and fully patched in version 7.6.5.

Critical Impact

Unauthenticated attackers can gain complete administrative access to WordPress sites by exploiting weak encryption in the social login validation process, potentially leading to full site compromise.

Affected Products

• miniOrange WordPress Social Login and Register (Discord, Google, Twitter, LinkedIn) versions up to 7.6.4
• WordPress installations using the affected plugin versions
• All WordPress sites with social login functionality enabled via this plugin

Discovery Timeline

• June 29, 2023 - CVE-2023-2982 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-2982

Vulnerability Analysis

This authentication bypass vulnerability stems from a fundamental cryptographic weakness in how the plugin validates user identities during social login operations. The plugin implements a custom encryption mechanism to protect user data passed during the OAuth callback process. However, the encryption used is insufficient, allowing attackers to forge valid authentication tokens.

When a user authenticates via a social provider (Discord, Google, Twitter, or LinkedIn), the plugin creates an encrypted parameter containing user identification data. Due to the weak encryption implementation, attackers can reverse-engineer or predict the encrypted values, enabling them to construct valid authentication requests for any user account.

The vulnerability is particularly severe because it requires no prior authentication, no user interaction, and can be exploited remotely over the network. An attacker only needs to know a valid email address associated with a WordPress account to gain unauthorized access.

Root Cause

The root cause lies in the insufficient encryption algorithm applied to user identification data during the social login validation flow. The plugin's authentication mechanism in mo-openid-social-login-functions.php fails to properly secure the user data parameter, making it susceptible to cryptographic attacks. The weak encryption allows attackers to either decrypt, predict, or forge valid authentication tokens that the plugin accepts as legitimate.

For technical details on the vulnerable code, refer to the WordPress Plugin Code Review.

Attack Vector

The attack exploits the social login callback mechanism in the WordPress plugin. An attacker can craft malicious requests that contain forged user identification data, which the plugin incorrectly validates due to the weak encryption. The attack flow is as follows:

1. Attacker identifies a target WordPress site using the vulnerable plugin
2. Attacker obtains or guesses an administrator's email address
3. Attacker constructs a forged authentication request with the target email
4. The weak encryption allows the attacker to create valid-looking credentials
5. Plugin validates the forged request and grants administrative access

The vulnerability requires no special privileges and can be exploited from any network location with access to the WordPress site. Detailed patch information is available in WordPress Changeset #2924863 and WordPress Changeset #2925914.

Detection Methods for CVE-2023-2982

Indicators of Compromise

• Unexpected administrator logins from unfamiliar IP addresses or geographic locations
• Authentication logs showing social login attempts for administrative accounts without corresponding OAuth provider activity
• Multiple failed or successful login attempts to high-privilege accounts via the social login endpoint
• New administrative users created without proper authorization workflows

Detection Strategies

• Monitor WordPress authentication logs for anomalous social login activity, particularly targeting administrative accounts
• Implement web application firewall (WAF) rules to detect unusual patterns in social login callback requests
• Review access logs for the mo-openid-social-login-functions.php endpoint for suspicious request patterns
• Deploy SentinelOne Singularity to detect unauthorized privilege escalation and anomalous authentication behavior

Monitoring Recommendations

• Enable comprehensive logging for all authentication events in WordPress, including social login callbacks
• Configure alerts for any administrative account access via social login mechanisms
• Establish baseline patterns for legitimate social login traffic to identify deviations
• Regularly audit user accounts and session activity for signs of unauthorized access

How to Mitigate CVE-2023-2982

Immediate Actions Required

• Update the WordPress Social Login and Register plugin to version 7.6.5 or later immediately
• Audit all WordPress user accounts for unauthorized administrative access or suspicious activity
• Review authentication logs to identify potential past exploitation attempts
• Consider temporarily disabling social login functionality until the patch is applied
• Reset passwords and invalidate sessions for all administrative accounts as a precautionary measure

Patch Information

The vulnerability was partially addressed in version 7.6.4 and fully patched in version 7.6.5. Site administrators should update to at least version 7.6.5 to fully remediate this vulnerability. The patches implement stronger encryption for user identification data and improve the overall validation logic for social login requests.

Patch details can be reviewed in the WordPress plugin changesets: Changeset #2924863 and Changeset #2925914.

For additional vulnerability analysis, refer to the Wordfence Vulnerability Analysis.

Workarounds

• Disable the WordPress Social Login and Register plugin until the update can be applied
• Implement IP-based access restrictions for the WordPress admin panel
• Enable two-factor authentication (2FA) for all administrative accounts as an additional security layer
• Use a web application firewall to block suspicious requests to social login endpoints

# Configuration example - Disable plugin via WP-CLI until patched
wp plugin deactivate miniorange-login-openid

# Verify current plugin version
wp plugin list --name=miniorange-login-openid --fields=name,version,status

# Update plugin to patched version
wp plugin update miniorange-login-openid