CVE-2026-43639 — Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients
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 `PO…
Published: 2026-05-11 · CVSS: 8.9 · CVSS 4.0
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).
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7