FKIE_CVE-2026-43914

Vulnerability from fkie_nvd - Published: 2026-05-11 23:20 - Updated: 2026-06-17 10:50
Severity
7.3 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.4, there is a security vulnerability in Vaultwarden that allows bypassing the login brute-force protection if email 2fa is enabled. If email 2fa is enabled, the unprotected 2fa-function send_email_login (email.rs, api endpoint /api/two-factor/send-email-login) also acts as an oracle determining whether a username-password combination is correct. An attacker can abuse that endpoint to brute-force passwords without rate-limiting. This works even for users who don't have email 2fa configured. This vulnerability is fixed in 1.35.4.
References
security-advisories@github.comhttps://github.com/dani-garcia/vaultwarden/pull/6867Issue Tracking, Patch
security-advisories@github.comhttps://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4Product, Release Notes
security-advisories@github.comhttps://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4gExploit, Patch, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4gExploit, Patch, Vendor Advisory
Impacted products
Vendor Product Version
dani-garcia vaultwarden *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "vaultwarden",
          "vendor": "dani-garcia",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.35.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
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              "criteria": "cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3EE3AB66-F61B-479C-A6C3-C2EEEB6FD55A",
              "versionEndExcluding": "1.35.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.4, there is a security vulnerability in Vaultwarden that allows bypassing the login brute-force protection if email 2fa is enabled. If email 2fa is enabled, the unprotected 2fa-function send_email_login (email.rs, api endpoint /api/two-factor/send-email-login) also acts as an oracle determining whether a username-password combination is correct. An attacker can abuse that endpoint to brute-force passwords without rate-limiting. This works even for users who don\u0027t have email 2fa configured. This vulnerability is fixed in 1.35.4."
    }
  ],
  "id": "CVE-2026-43914",
  "lastModified": "2026-06-17T10:50:04.537",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
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        "impactScore": 3.4,
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        "type": "Secondary"
      },
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          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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          "options": [
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            {
              "automatable": "yes"
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            {
              "technicalImpact": "partial"
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          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-12T12:51:45.245041Z",
          "version": "2.0.3"
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  },
  "published": "2026-05-11T23:20:22.253",
  "references": [
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      "tags": [
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        "Patch"
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      "url": "https://github.com/dani-garcia/vaultwarden/pull/6867"
    },
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      "source": "security-advisories@github.com",
      "tags": [
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      "url": "https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4"
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-307"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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