by Kastro
Paper/Archive/CVE-2026-128332

CVE-2026-128332

knadh listmonk — listmonk 6.0.0 before 7.0.0-beta.2 TOTP Brute-Force via /admin/login/twofa

CVSS 9.1
critical.is priorityof 100
27
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

Listmonk 6.0.0 before 7.0.0-beta.2 contains a 2FA bypass vulnerability that allows attackers with a valid password to brute-force TOTP codes because the attempt counter resets on every new password login. Attackers can repeatedly submit credentials to POST /admin/login to obtain fresh tokens, each allowing 15 more guesses, gaining sessions for 2FA-protected accounts including Super Admin.

Affected

ProductAffectedFixed inSource
listmonk6.0.0 – < 7.0.0-beta.27.0.0-beta.2CNA

Scores by source

VulnCheck (CNA)9.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

patchgithub.com/knadh/listmonk/commit/3f62a55c13dbc679b29238e890e4b90d6d4996d8refgithub.com/knadh/listmonk/releases/tag/v7.0.0-beta.2writeupgithub.com/knadh/listmonk/blob/v7.0.0-beta.1/internal/tmptokens/tmptokens.go#L13-L88writeupgithub.com/knadh/listmonk/blob/v7.0.0-beta.1/cmd/auth.go#L514-L568writeupvulncheck.com/advisories/listmonk-6.0.0-before-7.0.0-beta.2-totp-brute-force-via-admin-login-twofa