CVE-2026-92793: GoAdmin Authentication Bypass Vulnerability

CVE-2026-92793 Overview

CVE-2026-92793 is an authorization bypass vulnerability affecting GoAdmin through version 1.2.26. The framework fails to properly anchor the logout pattern when evaluating permissions. Authenticated users can append a crafted query parameter containing the admin prefix followed by /logout to reach administrative endpoints. Successful exploitation lets low-privileged users read sensitive data and modify application state without proper authorization. The weakness is classified under CWE-863: Incorrect Authorization.

Critical Impact

Authenticated attackers with low privileges can bypass permission checks and reach administrative endpoints over the network, resulting in unauthorized data access and state modification.

Affected Products

• GoAdmin framework through version 1.2.26
• Applications built on the GoAdmin modules/auth middleware
• Deployments using the default logout route matching in plugins/admin/models/user.go

Discovery Timeline

• 2026-09-16 - CVE-2026-92793 published to NVD
• 2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-92793

Vulnerability Analysis

GoAdmin uses a middleware-based permission model to decide whether an authenticated user can reach a given URL. The logout route is treated as universally accessible so that any authenticated user can terminate their session. The middleware compares the incoming request path against the logout pattern using an unanchored match. Because the comparison does not restrict the position of the pattern within the full URL, attackers can smuggle the logout string into a query parameter while the underlying handler is an administrative endpoint. See the GoAdmin auth middleware code and the user model segment for the affected logic.

Root Cause

The root cause is an improper authorization check that does not anchor the logout pattern to the URL path. Query string content is included in the matched string, allowing a permitted substring to satisfy the check on a restricted route. This pattern maps directly to CWE-863, where authorization logic evaluates the wrong portion of the request.

Attack Vector

An authenticated user issues an HTTP request to an administrative endpoint and appends a query parameter that contains the admin prefix followed by /logout. The middleware sees the logout substring, treats the request as permitted, and forwards it to the administrative handler. The handler executes the requested action under the caller's authenticated session. Full technical context is documented in the VulnCheck advisory and GoAdmin issue #690.

No verified proof-of-concept code is published in the referenced sources. Refer to the VulnCheck advisory for exploitation specifics.

Detection Methods for CVE-2026-92793

Indicators of Compromise

• HTTP requests to administrative paths that also contain a query string referencing the admin prefix and /logout.
• Authenticated sessions accessing admin endpoints they were not previously authorized to reach.
• Sudden write actions or configuration changes originating from low-privilege accounts.

Detection Strategies

• Inspect web server and application logs for requests where the query string contains /logout combined with administrative route prefixes.
• Correlate user role metadata with the endpoints each session touches to surface authorization anomalies.
• Deploy web application firewall rules that reject requests where control-plane keywords appear in query parameters for non-logout paths.

Monitoring Recommendations

• Centralize GoAdmin access logs and alert on requests to admin routes issued by non-admin accounts.
• Track deviations from baseline admin endpoint traffic per authenticated user.
• Enable audit logging for state-changing admin operations and review them on a short cadence.

How to Mitigate CVE-2026-92793

Immediate Actions Required

• Inventory all GoAdmin deployments and identify instances running version 1.2.26 or earlier.
• Restrict administrative endpoints at the reverse proxy so query strings containing /logout are rejected outside the actual logout route.
• Reduce the number of authenticated accounts with access to the GoAdmin console until a fix is deployed.

Patch Information

At the time of publication, no fixed release is referenced in the NVD entry. Monitor the GoAdmin GitHub repository and issue #690 for a patched version, and upgrade as soon as a corrected release is available. Apply the fix by rebuilding applications against the patched framework version.

Workarounds

• Enforce an anchored path check in front of GoAdmin, for example a reverse-proxy rule that only allows the logout pattern when it appears as the exact request path.
• Strip or normalize query parameters before the request reaches the GoAdmin middleware.
• Apply role-based network segmentation so admin endpoints are only reachable from trusted administrative networks.

# Example NGINX rule: block requests where a non-logout path carries /logout in the query string
location /admin/ {
    if ($args ~* "/logout(\?|&|$)") {
        return 403;
    }
    proxy_pass http://goadmin_backend;
}