CRITICALVulnerability
Verified
Global

NVD CRITICAL: CVE-2026-43639 — Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerabili...

·Source: NIST NVD

Updated:

Executive Summary

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).

Analysis

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). CVSS Score: 8. Published: 2026-05-11T18:16:36.970.

Indicators of Compromise (1)

CVE (1)
CVE-2026-43639
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on May 11, 2026. Verified by: NIST.

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