LangBot Password Recovery Key Weakness Leads to Account Takeover

Executive Summary

CVE-2026-90562 is an authentication bypass vulnerability in LangBot versions before 4.10.11. It allows remote attackers to gain administrative access by exploiting weak password recovery keys and the lack of rate limiting on the unauthenticated password reset endpoint. The recovery key has only 24 bits of entropy, making it vulnerable to brute-force attacks. Attackers can reset the admin password by knowing the admin's email and sending concurrent requests to exhaust the keyspace.

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Detection Guidance

Detect this vulnerability by checking LangBot versions before 4.10.11. Inspect the password reset endpoint `/api/v1/user/reset-password` for lack of rate limiting and low-entropy recovery keys. Monitor for excessive concurrent reset requests targeting admin accounts.

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Impact Analysis

If you use LangBot versions before 4.10.11, an attacker could reset the admin password and gain full administrative control. This could lead to unauthorized access to sensitive data, such as model-provider API keys and authenticated code-execution surfaces. The attacker only needs to know the admin's email address to exploit this vulnerability.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data privacy). Unauthorized access to admin accounts could result in data breaches, exposing personal or protected health information, leading to legal penalties and reputational damage.

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Mitigation Strategies

Upgrade LangBot to version 4.10.11 or later. Ensure recovery keys use high entropy (e.g., 256-bit tokens). Implement strict rate limiting (e.g., 5 attempts per 15 minutes per IP) and account lockout mechanisms. Use constant-time comparison for recovery key validation.

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