CVE-2026-43639
High · 8.0CVSS
8.0
EPSS
0.8%
Published
May 11, 2026
CISA due date
—
The record
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).
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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