Vulnerability · Published Sep 13, 2026 · Assigned by VulnCheck
CVE-2026-90562LangBot before 4.10.11 Authentication Bypass via Weak Recovery Key
High 8.1
In plain English
A high-severity security flaw in LangBot from langbot-app. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.7%top 45.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| langbot-app | LangBot | 4.0.8.1 – before 4.10.11 |
Weakness: CWE-331 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- GitHub Issue #2392 issue-tracking
- https://github.com/langbot-app/LangBot product
- https://github.com/langbot-app/LangBot/blob/v4.10.2/src/langbot/pkg/core/stages/genkeys.py technical-description
- https://github.com/langbot-app/LangBot/blob/v4.10.2/src/langbot/pkg/api/http/controller/groups/user.py technical-description
- https://github.com/langbot-app/LangBot/commit/267232c24f93c515d6fd3f7f81c0676066ab1ab8 patch
- VulnCheck Advisory: LangBot before 4.10.11 Authentication Bypass via Weak Recovery Key third-party-advisory