CVE-2026-126571 (GCVE-0-2026-126571)

Vulnerability from cvelistv5 – Published: 2026-11-11 02:36 – Updated: 2026-11-11 02:36
VLAI
Title
Padloc 4.0.0 before 4.3.1 Email MFA Code Brute Force via retrieveMFAToken
Summary
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.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
padloc padloc Affected: 4.0.0 , < 4.3.1 (semver)
Unaffected: 4.3.1 (semver)
Create a notification for this product.
Date Public
2026-11-10 10:36
Credits
Zachariah Mithani (AploSec)
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/padloc/padloc",
          "product": "padloc",
          "repo": "https://github.com/padloc/padloc",
          "vendor": "padloc",
          "versions": [
            {
              "lessThan": "4.3.1",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "4.3.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Zachariah Mithani (AploSec)"
        }
      ],
      "datePublic": "2026-11-10T10:36:46.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s email can brute force the 6-digit code to obtain verification tokens usable in signup, login and account recovery flows."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-307",
              "description": "Improper Restriction of Excessive Authentication Attempts",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-11T02:36:06.963Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-3mq5-m2qg-fqhq)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/padloc/padloc/security/advisories/GHSA-3mq5-m2qg-fqhq"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/padloc/padloc/commit/26f292515fe623826070454872f9cee08b756544"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/padloc/padloc/blob/v4.3.0/packages/core/src/v3-compat.ts#L191-L210"
        },
        {
          "name": "VulnCheck Advisory: Padloc 4.0.0 before 4.3.1 Email MFA Code Brute Force via retrieveMFAToken",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/padloc-4.0.0-before-4.3.1-email-mfa-code-brute-force-via-retrievemfatoken"
        }
      ],
      "title": "Padloc 4.0.0 before 4.3.1 Email MFA Code Brute Force via retrieveMFAToken",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-126571",
    "datePublished": "2026-11-11T02:36:06.963Z",
    "dateReserved": "2026-11-11T02:18:34.574Z",
    "dateUpdated": "2026-11-11T02:36:06.963Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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