CVE-2026-43639 | BDVDB-2026-332149 Detail
bitwardenserver
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).
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.
Weaknesses#
- CWE-862 Missing Authorization
References#
- https://sanjokkarki.com.np/blog/bitwarden-provider-takeover
- https://github.com/bitwarden/server/releases/tag/v2026.4.0
- https://github.com/bitwarden/server/pull/7372
- https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d
- https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients
Exploit#
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.