CVE-2026-93462: baserCMS Authentication Bypass Vulnerability

CVE-2026-93462 Overview

CVE-2026-93462 is a missing authentication vulnerability [CWE-306] affecting baserCMS, an open-source content management system. The flaw allows a remote unauthenticated attacker to access a critical function without providing credentials. Successful exploitation can expose sensitive information stored or processed by the application.

The issue is network-reachable and requires no privileges or user interaction. It affects the confidentiality of application data but does not directly impact integrity or availability. Administrators running baserCMS installations exposed to untrusted networks should treat this as a priority item for patching.

Critical Impact

A remote unauthenticated attacker can invoke a protected baserCMS function and retrieve sensitive information from the application.

Affected Products

• baserCMS (vendor advisory JVN_14353754)
• Refer to the BaserCMS Security Advisory JVN_14353754 for the exact affected version range
• Refer to the JVN Security Advisory JVN14353754 for coordinated disclosure details

Discovery Timeline

• 2026-09-30 - CVE-2026-93462 published to NVD
• 2026-09-30 - Last updated in NVD database

Technical Details for CVE-2026-93462

Vulnerability Analysis

The vulnerability is classified under [CWE-306]: Missing Authentication for Critical Function. baserCMS exposes a function that performs a security-relevant action but does not verify the requester's identity before executing it. An attacker can reach the endpoint directly over the network and obtain data that should require an authenticated session.

Because no authentication check is performed, exploitation is straightforward. The attacker sends a crafted HTTP request to the vulnerable endpoint and receives sensitive information in the response. No credentials, tokens, or user interaction are required.

The impact is limited to confidentiality according to the CVSS vector. The specific data exposed depends on the function reached, but vendor communications describe it as sensitive information. See the BaserCMS Security Advisory JVN_14353754 for the affected component details.

Root Cause

The root cause is a missing access control check on a function that handles sensitive data. baserCMS treats the endpoint as if it were public or assumes callers arrive through an authenticated context. The authorization gate that should precede the operation is absent, allowing any HTTP client to invoke it.

Attack Vector

The attack vector is network-based. An attacker sends an unauthenticated HTTP request to the exposed baserCMS endpoint. Any internet-facing installation without additional access controls is reachable. The vulnerability requires no prior foothold and can be executed by automated scanners.

No verified public proof-of-concept code is available at the time of publication. Consult the JVN Security Advisory JVN14353754 for further technical context.

Detection Methods for CVE-2026-93462

Indicators of Compromise

• Unauthenticated HTTP requests to baserCMS administrative or API endpoints originating from external IP addresses
• Anomalous response sizes returned from baserCMS endpoints that normally require authentication
• Access log entries showing successful HTTP 200 responses on sensitive paths without a preceding login sequence

Detection Strategies

• Review baserCMS web server access logs for requests to the endpoint identified in the vendor advisory that lack an authenticated session cookie
• Correlate high-volume enumeration patterns from single source addresses against baserCMS installations
• Deploy web application firewall rules that alert on unauthenticated access to sensitive baserCMS routes

Monitoring Recommendations

• Forward baserCMS and reverse-proxy logs to a centralized log platform for retention and query
• Alert on spikes in traffic to baserCMS endpoints from unfamiliar geographies or IP ranges
• Baseline normal authenticated request patterns and flag deviations for review

How to Mitigate CVE-2026-93462

Immediate Actions Required

• Apply the fixed baserCMS release listed in the BaserCMS Security Advisory JVN_14353754 as soon as it is available in your environment
• Restrict network access to baserCMS administrative interfaces using IP allowlists or VPN gating
• Audit access logs for prior unauthenticated requests to the affected endpoint and investigate any matches

Patch Information

Refer to the vendor advisory at basercms.net and the JVN coordinated disclosure entry for the fixed version and patch guidance. Upgrade to the vendor-recommended release to restore the authentication check on the affected function.

Workarounds

• Place baserCMS behind an authenticating reverse proxy that enforces session validation before requests reach the application
• Use web application firewall rules to block unauthenticated requests to the endpoint identified in the vendor advisory
• Remove or disable the affected functionality until the patched version can be deployed if operationally feasible

# Example nginx configuration to restrict baserCMS admin paths by source IP
location /admin/ {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://basercms_backend;
}