CVE-2026-77770 Overview
CVE-2026-77770 affects the miniOrange 2FA WordPress plugin before version 6.3.1 and version 19.3. The plugin fails to require a validated transaction before deleting site options whose names come from unauthenticated request input. Any unauthenticated visitor can delete arbitrary WordPress options. Successful exploitation can lock every administrator out of the dashboard or deactivate the miniOrange 2FA plugin site-wide, disabling multi-factor authentication protections. The flaw is a broken access control issue combined with missing input validation on option deletion endpoints.
Critical Impact
Unauthenticated attackers can delete arbitrary WordPress site options, causing administrator lockout and disabling of the miniOrange 2FA multi-factor authentication plugin.
Affected Products
- miniOrange 2FA WordPress plugin versions before 6.3.1
- miniOrange 2FA WordPress plugin versions before 19.3
- WordPress sites relying on miniOrange 2FA for multi-factor authentication
Discovery Timeline
- 2026-09-10 - CVE-2026-77770 published to NVD
- 2026-09-10 - Last updated in NVD database
Technical Details for CVE-2026-77770
Vulnerability Analysis
The vulnerability resides in a plugin endpoint that accepts an option name from unauthenticated HTTP request input and passes it directly to WordPress option deletion functionality. The plugin does not validate a transaction token, nonce, or capability check before performing the deletion. Because option names are user-controlled, an attacker can target any option stored in the wp_options table.
Deleting critical options such as those governing user roles, active plugins, or site URL configuration can lock administrators out of the dashboard. Removing the miniOrange 2FA configuration entries can disable multi-factor authentication across the site, weakening account protection for all users.
Root Cause
The root cause is a missing authorization and missing request validation flaw [CWE-862, CWE-352]. The affected handler does not verify a WordPress nonce, does not enforce a capability check such as manage_options, and does not restrict which option names may be deleted. This combination allows unauthenticated arbitrary option deletion.
Attack Vector
An attacker sends a crafted HTTP request to the vulnerable plugin endpoint, supplying the target option name in the request parameters. No authentication, session, or user interaction is required. The attack can be scripted and executed at scale against any WordPress site running the vulnerable plugin versions.
See the WPScan Vulnerability Advisory for the technical write-up and affected request parameters.
Detection Methods for CVE-2026-77770
Indicators of Compromise
- Unauthenticated POST or GET requests to miniOrange 2FA plugin endpoints containing option name parameters
- Sudden inability of administrators to log in to WordPress or missing 2FA prompts after previously being enforced
- Missing rows in the wp_options table for active_plugins, siteurl, home, or mo2f_* prefixed entries
- Web server access logs showing repeated requests to /wp-admin/admin-ajax.php or plugin-specific paths referencing option deletion actions
Detection Strategies
- Inspect access logs for anonymous requests targeting miniOrange 2FA plugin action handlers with option name parameters
- Compare current wp_options contents against known-good backups to identify unauthorized deletions
- Alert on WordPress error logs reporting option not found for previously present configuration keys
Monitoring Recommendations
- Enable audit logging for changes to the wp_options table using a WordPress activity monitor
- Forward WordPress and web server logs to a centralized SIEM for correlation of anonymous plugin requests with option deletion events
- Monitor administrator authentication success and failure trends for sudden anomalies indicating lockout
How to Mitigate CVE-2026-77770
Immediate Actions Required
- Update the miniOrange 2FA WordPress plugin to version 6.3.1 or later, or to version 19.3 or later as applicable to your installation
- Take a full backup of the WordPress database, including the wp_options table, before applying patches
- Review recent web server logs for suspicious anonymous requests to plugin endpoints and confirm no prior exploitation
Patch Information
The vendor addresses the flaw in miniOrange 2FA WordPress plugin versions 6.3.1 and 19.3. Administrators should apply the latest available version from the WordPress plugin repository. Refer to the WPScan Vulnerability Advisory for advisory details.
Workarounds
- Temporarily deactivate the miniOrange 2FA plugin until the patched version is installed, and enforce alternative multi-factor authentication
- Restrict access to /wp-admin/admin-ajax.php and plugin-specific endpoints at the web application firewall level for unauthenticated sources
- Block requests containing suspicious option name parameters targeting the vulnerable plugin actions using WAF rules
# Example WAF rule concept: block unauthenticated requests to the vulnerable action
# Adapt to your WAF syntax (ModSecurity, Cloudflare, etc.)
SecRule REQUEST_URI "@contains /wp-admin/admin-ajax.php" \
"chain,deny,status:403,msg:'Block miniOrange 2FA CVE-2026-77770 exploit attempt'"
SecRule ARGS:action "@rx (mo2f|miniorange).*delete.*option" \
"chain"
SecRule &REQUEST_COOKIES:wordpress_logged_in "@eq 0"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
