What’s Vulnerable › Vulnerabilities

CVE-2026-90562: LangBot before 4.10.11 Authentication Bypass via Weak Recovery Key

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-13 · updated 2026-09-23
• Weakness: CWE-331

Description

LangBot before 4.10.11 generates password recovery keys with only 24 bits of entropy and applies no rate limiting to the unauthenticated reset-password endpoint. Remote attackers knowing the administrator email can exhaust the keyspace through concurrent requests to reset the admin password and gain account access.

Affected products

• langbot-app LangBot: from 4.0.8.1 before 4.10.11 — fixed in 4.10.11

How to fix

Upgrade to a fixed version: langbot-app LangBot 4.10.11. Check the vendor advisory for mitigations.

References

• https://github.com/langbot-app/LangBot
• https://github.com/langbot-app/LangBot/blob/v4.10.2/src/langbot/pkg/api/http/controller/groups/user.py
• https://github.com/langbot-app/LangBot/blob/v4.10.2/src/langbot/pkg/core/stages/genkeys.py
• https://github.com/langbot-app/LangBot/commit/267232c24f93c515d6fd3f7f81c0676066ab1ab8
• https://github.com/langbot-app/LangBot/issues/2392
• https://www.vulncheck.com/advisories/langbot-before-4.10.11-authentication-bypass-via-weak-recovery-key
• https://github.com/langbot-app/LangBot/issues/2392

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