CVE-2026-90712
Deferred Deferred - Pending Action

xAI OAuth Callback Handler Denial of Service via Error Manipulation

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: VulDB

Description
A vulnerability was identified in Gitlawb openclaude up to 0.30.0. Impacted is the function waitForCallback of the file src/services/api/xaiOAuthCallback.ts of the component xAI OAuth Callback Handler. The manipulation of the argument Error leads to denial of service. Remote exploitation of the attack is possible. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-15
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-90712
EUVD
EUVD-2026-77427

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gitlawb openclaude to 0.30.0 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-404 The product does not release or incorrectly releases a resource before it is made available for re-use.

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Executive Summary

This vulnerability is a Denial of Service (DoS) issue in the xAI OAuth Callback Handler of Gitlawb openclaude up to version 0.30.0. The problem occurs in the waitForCallback function where the server processes the Error argument before validating the CSRF state parameter. An attacker can exploit this by sending a cross-origin request with an error parameter to the loopback server on port 56121, causing the authentication flow to terminate prematurely.

Detection Guidance

Check if OpenClaude is running on your system by inspecting processes for openclaude or related services. Monitor network traffic on port 56121 for unexpected requests to the loopback callback server. Look for failed OAuth login attempts or silent authentication failures in logs.

Impact Analysis

This vulnerability allows an attacker to disrupt the OAuth login process for users of Gitlawb openclaude. Victims may experience failed login attempts while seeing a misleading success message in their browser. The attack can cause legitimate users to be unable to authenticate, leading to denial of service for the affected service.

Compliance Impact

The vulnerability (CVE-2026-90712) enables denial of service attacks during OAuth authentication flows, which could disrupt access to systems handling sensitive data. This may impact compliance with GDPR by potentially exposing personal data during failed authentication attempts or violating availability requirements. For HIPAA, the DoS risk could interrupt access to protected health information systems, though no direct data exposure is described. The vulnerability's impact depends on deployment context and mitigations.

Mitigation Strategies

Update OpenClaude to the latest version if a patch is available. If not, disable the xAI OAuth callback handler or restrict access to the loopback server port 56121. Implement network-level controls to block external access to this port.

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