CVE-2026-65757: Authentication Bypass Vulnerability

CVE-2026-65757 Overview

CVE-2026-65757 is an access control weakness affecting a Regular Labs extension. The editor popup component returns restricted module data to authenticated users who lack the required module permissions or a valid request token. The flaw maps to Common Weakness Enumeration [CWE-284] Improper Access Control.

The issue permits information disclosure across trust boundaries within the application. Any authenticated account, including low-privilege users, can retrieve module content that should be scoped to authorized roles. The National Vulnerability Database (NVD) has not published a severity score at the time of writing.

Critical Impact
Authenticated users can read restricted module data without proper permission checks or token validation, undermining role-based access controls.

Affected Products

Regular Labs extension (specific product and versions not enumerated in the NVD entry)
See the Regular Labs Homepage for product identification
CPE identifiers were not published with this CVE record

Discovery Timeline

2026-07-23 - CVE-2026-65757 published to the National Vulnerability Database
2026-07-23 - Last updated in NVD database

Technical Details for CVE-2026-65757

Vulnerability Analysis

The vulnerability resides in the editor popup workflow. Editor popups typically load supporting module data to allow content authors to insert or configure elements inline. In the affected implementation, the endpoint serving that data does not verify two conditions before returning results.

First, it does not confirm that the requesting user holds the module permissions required to view the target resource. Second, it does not validate a request token that would bind the call to an authorized editor session. An authenticated user with minimal privileges can therefore invoke the endpoint and receive module data intended for privileged roles.

The consequence is confidentiality loss. Module content may include configuration values, restricted text, embedded credentials, or business logic details that were segmented by role for a reason. The classification under [CWE-284] Improper Access Control reflects the missing authorization decision rather than a code execution or memory corruption issue.

Root Cause

The root cause is a missing authorization check combined with absent anti-CSRF token verification on the popup data endpoint. The handler executes the data lookup before, or without, calling the access control layer that governs module visibility. Refer to the Regular Labs Homepage for advisory updates.

Attack Vector

An attacker authenticates to the application with any valid account. The attacker issues a request to the editor popup endpoint referencing a restricted module identifier. The server returns the module data because it does not enforce the permission check or token requirement. No user interaction from a higher-privileged victim is required.

No verified proof-of-concept code has been published. The vulnerability is described in prose based on the NVD summary and CWE mapping.

Detection Methods for CVE-2026-65757

Indicators of Compromise

Repeated requests from low-privilege user sessions to editor popup endpoints referencing module identifiers outside their assigned scope
HTTP requests to the popup handler lacking the expected anti-CSRF token or referrer chain
Access log entries where the same session enumerates sequential module IDs in short time windows

Detection Strategies

Correlate authenticated session role with the module IDs returned by popup endpoints and alert on mismatches
Baseline normal editor popup usage per role and flag deviations, such as standard users triggering administrative module lookups
Review web server and application logs for popup endpoint calls that succeed without a valid token parameter

Monitoring Recommendations

Enable verbose audit logging on the Regular Labs extension endpoints handling module data
Forward web application logs to a centralized analytics platform for role-versus-resource correlation
Track spikes in 200 OK responses from popup endpoints tied to non-editor accounts

How to Mitigate CVE-2026-65757

Immediate Actions Required

Identify all installations of the affected Regular Labs extension across production and staging environments
Restrict access to the editor popup endpoint at the web server or reverse proxy layer until a patch is applied
Audit recent access logs for unauthorized module data retrieval by non-administrative accounts
Rotate any secrets or configuration values that may have been exposed through restricted modules

Patch Information

A vendor patch reference was not included in the NVD entry at publication. Administrators should consult the Regular Labs Homepage for the current advisory and fixed version information. Apply the vendor-supplied update as soon as it becomes available.

Workarounds

Temporarily disable the affected editor popup feature if the extension configuration permits it
Limit accounts with authenticated access to the content management interface to trusted users only
Enforce strict role separation so that low-privilege accounts cannot reach editor endpoints
Add a web application firewall rule requiring a valid session token on popup data requests

bash

# Example web server rule restricting the popup endpoint to trusted roles
# Replace paths and identifiers with values from your deployment
location ~* /index.php\?option=com_regularlabs.*task=.*popup {
    if ($http_x_requested_with != "XMLHttpRequest") { return 403; }
    # Require an authenticated administrative cookie context
    if ($cookie_role !~* "editor|admin") { return 403; }
}