CVE-2026-126571

MEDIUM 4.8

Padloc 4.0.0 before 4.3.1 Email MFA Code Brute Force via retrieveMFAToken

CVSS Score

4.8

EPSS Score

0.0%

EPSS Percentile

0th

Padloc 4.0.0 before 4.3.1 contains an authentication bypass vulnerability in the legacy retrieveMFAToken handler that never counts wrong email verification codes toward the attempt limit. Unauthenticated attackers knowing a victim's email can brute force the 6-digit code to obtain verification tokens usable in signup, login and account recovery flows.

CWE	CWE-307
Vendor	padloc
Product	padloc
Published	Nov 11, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

padloc / padloc

4.0.0 < 4.3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/padloc/padloc/security/advisories/GHSA-3mq5-m2qg-fqhq github.com: https://github.com/padloc/padloc/commit/26f292515fe623826070454872f9cee08b756544 github.com: https://github.com/padloc/padloc/blob/v4.3.0/packages/core/src/v3-compat.ts#L191-L210 vulncheck.com: https://www.vulncheck.com/advisories/padloc-4.0.0-before-4.3.1-email-mfa-code-brute-force-via-retrievemfatoken

Credits

Zachariah Mithani (AploSec)