CVE-2026-10218 Overview
CVE-2026-10218 is an improper authorization vulnerability [CWE-266] in nextlevelbuilder GoClaw versions up to 3.11.3. The flaw resides in the auth function within internal/http/evolution_handlers.go. Attackers can exploit the weakness remotely over the network with low privileges and without user interaction. The project maintainers have tagged the reported issue as a bug. The exploit details have been disclosed publicly, though no active exploitation has been confirmed.
Critical Impact
Remote attackers with low-privilege access can bypass authorization checks in the auth handler, leading to limited integrity and availability impact on affected GoClaw deployments.
Affected Products
- nextlevelbuilder GoClaw versions up to and including 3.11.3
- Component: internal/http/evolution_handlers.go
- Function: auth
Discovery Timeline
- 2026-06-01 - CVE-2026-10218 published to the National Vulnerability Database
- 2026-06-01 - Last updated in NVD database
Technical Details for CVE-2026-10218
Vulnerability Analysis
The vulnerability stems from improper authorization logic inside the auth function in internal/http/evolution_handlers.go. The handler fails to correctly enforce access control decisions when processing inbound HTTP requests. As a result, authenticated low-privilege users can perform actions that should require additional authorization.
The weakness is categorized under [CWE-266] (Incorrect Privilege Assignment). According to the EPSS model, the probability of exploitation in the next 30 days is low, consistent with the limited scope of impact. The disclosed proof-of-concept is publicly referenced through VulDB, increasing the likelihood that opportunistic actors may probe exposed GoClaw instances.
Root Cause
The root cause is missing or incomplete privilege validation within the auth handler. The function does not adequately verify that the requesting principal holds the rights required for the requested operation. This permits horizontal or limited vertical access to resources that should remain restricted to higher-privileged roles.
Attack Vector
The attack vector is network-based. An attacker authenticates with low-level credentials, then issues crafted HTTP requests to endpoints serviced by evolution_handlers.go. Because authorization is not enforced consistently, the server processes the request and returns or modifies protected data. No user interaction is required, and attack complexity is low.
No verified exploitation code is available at this time. Refer to the GitHub Issue Discussion and the VulDB CVE-2026-10218 entry for technical context.
Detection Methods for CVE-2026-10218
Indicators of Compromise
- Unexpected HTTP requests from low-privilege accounts targeting endpoints handled by internal/http/evolution_handlers.go.
- Authorization-related log entries showing successful access to resources outside the user's normal role scope.
- Repeated probing of GoClaw API routes from a single source IP shortly after authentication.
Detection Strategies
- Audit application logs for requests where the authenticated principal's role does not match the resource being accessed.
- Compare HTTP request patterns against baseline behavior for each user role to surface privilege deviations.
- Review GoClaw deployments for instances running versions up to 3.11.3 and correlate with inbound traffic to the auth handler.
Monitoring Recommendations
- Forward GoClaw application and reverse-proxy logs to a centralized SIEM for correlation with identity events.
- Alert on bursts of HTTP 200 responses to sensitive endpoints from accounts that historically receive 401 or 403 responses.
- Track changes to authorization configuration files and middleware definitions tied to evolution_handlers.go.
How to Mitigate CVE-2026-10218
Immediate Actions Required
- Inventory all GoClaw deployments and identify any running version 3.11.3 or earlier.
- Restrict network exposure of GoClaw HTTP endpoints to trusted networks until a fixed release is applied.
- Review and tighten role assignments to minimize the impact of any successful authorization bypass.
- Monitor the GitHub Project Repository for an official patched release.
Patch Information
At the time of publication, the issue has been acknowledged in the upstream project and tagged as a bug. Track remediation progress through the GitHub Issue Discussion and apply the next maintainer-released version that addresses the auth handler logic. Additional context is available in the VulDB Vulnerability #367497 record.
Workarounds
- Place GoClaw behind an authenticating reverse proxy that enforces role-based access control independent of the application's auth handler.
- Disable or firewall the endpoints exposed by evolution_handlers.go where they are not required for production functionality.
- Apply principle-of-least-privilege to all GoClaw user accounts to reduce the attack surface available to low-privilege actors.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
