by Kastro
Paper/Archive/CVE-2026-90562

CVE-2026-90562

langbot-app LangBot — LangBot before 4.10.11 Authentication Bypass via Weak Recovery Key

EPSS 0.7%public exploitCVSS 9.2
critical.is priorityof 100
49
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 54.5.545 × 2010.9Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
LangBot4.0.8.1 – < 4.10.114.10.11CNA

Scores by source

VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
VulnCheck (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/langbot-app/LangBot/issues/2392refgithub.com/langbot-app/LangBotwriteupgithub.com/langbot-app/LangBot/blob/v4.10.2/src/langbot/pkg/core/stages/genkeys.pywriteupgithub.com/langbot-app/LangBot/blob/v4.10.2/src/langbot/pkg/api/http/controller/groups/user.pypatchgithub.com/langbot-app/LangBot/commit/267232c24f93c515d6fd3f7f81c0676066ab1ab8writeupvulncheck.com/advisories/langbot-before-4.10.11-authentication-bypass-via-weak-recovery-key