CVE-2026-10617: GoClaw Authentication Bypass Vulnerability

CVE-2026-10617 Overview

CVE-2026-10617 is a missing authentication vulnerability in nextlevelbuilder GoClaw through version 3.11.3. The flaw resides in the resolveAuth function within internal/http/auth.go, which serves as the Webhook Verification Handler. An attacker can exploit the issue remotely over the network without authentication or user interaction. The project maintainers have publicly acknowledged the issue and tagged it as a bug. Public disclosure of the exploit increases the likelihood that opportunistic actors will probe exposed GoClaw deployments. The weakness is classified under CWE-287: Improper Authentication.

Critical Impact
Remote attackers can bypass webhook authentication checks in GoClaw deployments, potentially forging or replaying webhook events processed by the application.

Affected Products

nextlevelbuilder GoClaw versions up to and including 3.11.3
Component: Webhook Verification Handler (internal/http/auth.go)
Affected function: resolveAuth

Discovery Timeline

2026-06-02 - CVE-2026-10617 published to NVD
2026-06-02 - Last updated in NVD database

Technical Details for CVE-2026-10617

Vulnerability Analysis

The vulnerability stems from the resolveAuth function in internal/http/auth.go failing to enforce authentication on inbound webhook requests. Webhook verification handlers typically validate a shared secret, HMAC signature, or token presented by the calling service. When this validation is missing or improperly applied, the application treats unverified requests as legitimate. As a result, the Webhook Verification Handler accepts requests from any source that can reach the listening endpoint. Confidentiality, integrity, and availability are each affected at a limited level, reflecting that the handler operates on webhook-scoped data rather than full administrative state. Additional analysis is published in the VulDB CVE Report and VulDB Vulnerability Details.

Root Cause

The root cause is improper authentication ([CWE-287]) in resolveAuth. The function does not reliably reject requests that lack valid credentials, allowing the request pipeline to continue processing webhook payloads as authenticated events.

Attack Vector

Exploitation is performed remotely over the network. An attacker crafts HTTP requests to the GoClaw webhook endpoint without supplying valid authentication material. Because resolveAuth does not block these requests, downstream handlers act on attacker-controlled webhook data. Public proof-of-concept information is referenced in the GitHub Issue Tracker.

No verified exploit code is available for inclusion. Refer to the GitHub Project Repository and VulDB CTI Information for technical details on the exploitation path.

Detection Methods for CVE-2026-10617

Indicators of Compromise

Webhook events processed by GoClaw that lack a corresponding signature header or arrive from source IPs outside expected webhook providers.
Unexpected state changes or downstream actions triggered by webhook payloads without matching upstream provider events.
HTTP requests to GoClaw webhook routes with missing or malformed authentication headers that still return success responses.

Detection Strategies

Review GoClaw access logs for POST requests to webhook endpoints handled by resolveAuth and correlate them with verified webhook provider deliveries.
Deploy network monitoring rules that flag webhook traffic originating from IP ranges not associated with the configured webhook senders.
Compare webhook-driven application events against provider-side delivery logs to identify forged or replayed requests.

Monitoring Recommendations

Forward GoClaw application and HTTP access logs to a centralized analytics platform for retention and correlation.
Alert on any webhook request accepted without a valid signature header once mitigations are deployed.
Track the version of GoClaw running on each host and alert when instances older than the patched release remain in production.

How to Mitigate CVE-2026-10617

Immediate Actions Required

Inventory all GoClaw deployments and identify any running version 3.11.3 or earlier.
Restrict network access to GoClaw webhook endpoints using firewalls or reverse proxy allowlists limited to known webhook provider IP ranges.
Rotate any shared webhook secrets that may have been observed by unauthenticated requesters.
Audit recent webhook-driven actions for events that cannot be matched to legitimate provider deliveries.

Patch Information

At the time of publication, no fixed version is referenced in the NVD entry. Monitor the GitHub Project Repository and the linked GitHub Issue Tracker for an official patched release of GoClaw and upgrade as soon as a fixed version is published.

Workarounds

Place GoClaw behind a reverse proxy that validates webhook signatures before forwarding requests to the application.
Enforce mutual TLS or IP allowlisting on the webhook endpoint until an upstream fix is available.
Disable or remove webhook routes that are not required for production operation.

bash

# Example nginx configuration restricting GoClaw webhook endpoint to known sender IPs
location /webhook {
    allow 192.0.2.0/24;   # replace with webhook provider IP range
    deny  all;
    proxy_pass http://127.0.0.1:8080;
}