Vulnerability-Lookup

CVE-2026-31835 (GCVE-0-2026-31835)

Vulnerability from cvelistv5 – Published: 2026-05-05 18:51 – Updated: 2026-05-06 12:46

Title

Vaultwarden WebAuthn credential metadata tampered before signature verification

Summary

Vaultwarden is a Bitwarden-compatible server written in Rust. In versions 1.35.4 and earlier, the WebAuthn authentication flow in `validate_webauthn_login()` updates persistent credential metadata (1backup_eligible1 and 1backup_state flags1) based on unverified `authenticatorData` before signature validation is performed. An attacker who knows a user's password but cannot produce a valid WebAuthn signature can permanently modify the stored backup flags for that user's credential. If signature verification fails, the database update is not rolled back. This can result in a persistent denial of service of WebAuthn two-factor authentication for affected credentials. This issue has been fixed in version 1.35.5.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/dani-garcia/vaultwarden/securi…	x_refsource_CONFIRM
https://github.com/dani-garcia/vaultwarden/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
dani-garcia	vaultwarden	Affected: < 1.35.5

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-31835

Vulnerability from fkie_nvd - Published: 2026-05-05 19:16 - Updated: 2026-06-17 10:34

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.5	Product, Release Notes
security-advisories@github.com	https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-x7g7-cgx5-jhx2	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-x7g7-cgx5-jhx2	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	dani-garcia	vaultwarden	*

JSON

To clipboard

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          "product": "vaultwarden",
          "vendor": "dani-garcia",
          "versions": [
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  ],
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    }
  ],
  "id": "CVE-2026-31835",
  "lastModified": "2026-06-17T10:34:32.820",
  "metrics": {
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        {
          "lang": "en",
          "value": "CWE-345"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

WID-SEC-W-2026-1285

Vulnerability from csaf_certbund - Published: 2026-04-26 22:00 - Updated: 2026-05-12 22:00

Summary

Vaultwarden: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Vaultwarden ist eine alternative Implementierung der Server API des Bitwarden Passwort-Managers.

Angriff: Ein Angreifer kann mehrere Schwachstellen in Vaultwarden ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen, und um Informationen offenzulegen.

Betroffene Betriebssysteme: - Linux - Sonstiges - UNIX - Windows

CVE-2026-31835

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source Vaultwarden <1.35.5 Open Source / Vaultwarden		<1.35.5

CVE-2026-33420

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source Vaultwarden <1.35.5 Open Source / Vaultwarden		<1.35.5

CVE-2026-43911

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source Vaultwarden <1.35.5 Open Source / Vaultwarden		<1.35.5

CVE-2026-43912

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source Vaultwarden <1.35.5 Open Source / Vaultwarden		<1.35.5

CVE-2026-43913

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source Vaultwarden <1.35.5 Open Source / Vaultwarden		<1.35.5

CVE-2026-43914

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source Vaultwarden <1.35.5 Open Source / Vaultwarden		<1.35.5

References

7 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/dani-garcia/vaultwarden/securi…	external
https://github.com/dani-garcia/vaultwarden/securi…	external
https://github.com/dani-garcia/vaultwarden/securi…	external
https://github.com/dani-garcia/vaultwarden/securi…	external
https://github.com/dani-garcia/vaultwarden/securi…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Vaultwarden ist eine alternative Implementierung der Server API des Bitwarden Passwort-Managers.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Vaultwarden ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuf\u00fchren, und um Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- Sonstiges\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1285 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1285.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1285 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1285"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-6j4w-g4jh-xjfx vom 2026-04-26",
        "url": "https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-6j4w-g4jh-xjfx"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-937x-3j8m-7w7p vom 2026-04-26",
        "url": "https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-937x-3j8m-7w7p"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-c5rv-q295-7w4g vom 2026-04-26",
        "url": "https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-jjxg-p3v6-52ww vom 2026-04-26",
        "url": "https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-jjxg-p3v6-52ww"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-x7g7-cgx5-jhx2 vom 2026-04-26",
        "url": "https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-x7g7-cgx5-jhx2"
      }
    ],
    "source_lang": "en-US",
    "title": "Vaultwarden: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-05-12T22:00:00.000+00:00",
      "generator": {
        "date": "2026-05-13T07:47:08.260+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-1285",
      "initial_release_date": "2026-04-26T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-04-26T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-05-05T22:00:00.000+00:00",
          "number": "2",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-27448, EUVD-2026-27424"
        },
        {
          "date": "2026-05-11T22:00:00.000+00:00",
          "number": "3",
          "summary": "CVE\u0027s erg\u00e4nzt"
        },
        {
          "date": "2026-05-12T22:00:00.000+00:00",
          "number": "4",
          "summary": "Referenz(en) aufgenommen: 2476356, 2476359, 2476363"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c1.35.5",
                "product": {
                  "name": "Open Source Vaultwarden \u003c1.35.5",
                  "product_id": "T053355"
                }
              },
              {
                "category": "product_version",
                "name": "1.35.5",
                "product": {
                  "name": "Open Source Vaultwarden 1.35.5",
                  "product_id": "T053355-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:vaultwarden:vaultwarden:1.35.5"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Vaultwarden"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-31835",
      "product_status": {
        "known_affected": [
          "T053355"
        ]
      },
      "release_date": "2026-04-26T22:00:00.000+00:00",
      "title": "CVE-2026-31835"
    },
    {
      "cve": "CVE-2026-33420",
      "product_status": {
        "known_affected": [
          "T053355"
        ]
      },
      "release_date": "2026-04-26T22:00:00.000+00:00",
      "title": "CVE-2026-33420"
    },
    {
      "cve": "CVE-2026-43911",
      "product_status": {
        "known_affected": [
          "T053355"
        ]
      },
      "release_date": "2026-04-26T22:00:00.000+00:00",
      "title": "CVE-2026-43911"
    },
    {
      "cve": "CVE-2026-43912",
      "product_status": {
        "known_affected": [
          "T053355"
        ]
      },
      "release_date": "2026-04-26T22:00:00.000+00:00",
      "title": "CVE-2026-43912"
    },
    {
      "cve": "CVE-2026-43913",
      "product_status": {
        "known_affected": [
          "T053355"
        ]
      },
      "release_date": "2026-04-26T22:00:00.000+00:00",
      "title": "CVE-2026-43913"
    },
    {
      "cve": "CVE-2026-43914",
      "product_status": {
        "known_affected": [
          "T053355"
        ]
      },
      "release_date": "2026-04-26T22:00:00.000+00:00",
      "title": "CVE-2026-43914"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-31835 (GCVE-0-2026-31835)

FKIE_CVE-2026-31835

WID-SEC-W-2026-1285

Tags

Sightings

Nomenclature