Vulnerabilities CVE-2026-43639

CVE-2026-43639

High

Open

TLP:CLEAR

Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients

NVD CVE.org

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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).

Details

CVSS Score: 8.9
EPSS Score ⓘ: 0.60%

45.3th percentile
CVSS 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
Confidence: 90%
Published: May 11, 2026
Last Modified: Jul 14, 2026

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