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Advisories

Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients

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severity
high
date
Affecting

  • Bitwarden Server < 2026.4.0

CWE
  • CWE-862 Missing Authorization
CVSS
8.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
Sanjok Karki
Description
Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organization to their provider via `POST /providers/{providerId}/clients/existing`, resulting in takeover of the target organization; self-hosted installations are unaffected as this endpoint is restricted to Cloud via SelfHosted(NotSelfHostedOnly = true).

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