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).
References
| Link | Resource |
|---|---|
| https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d | Patch |
| https://github.com/bitwarden/server/pull/7372 | Issue Tracking Patch |
| https://github.com/bitwarden/server/releases/tag/v2026.4.0 | Release Notes |
| https://sanjokkarki.com.np/blog/bitwarden-provider-takeover | Exploit Third Party Advisory |
| https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients | Third Party Advisory |
Configurations
History
16 May 2026, 03:04
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d - Patch | |
| References | () https://github.com/bitwarden/server/pull/7372 - Issue Tracking, Patch | |
| References | () https://github.com/bitwarden/server/releases/tag/v2026.4.0 - Release Notes | |
| References | () https://sanjokkarki.com.np/blog/bitwarden-provider-takeover - Exploit, Third Party Advisory | |
| References | () https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients - Third Party Advisory | |
| First Time |
Bitwarden server
Bitwarden |
|
| CPE | cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:* |
11 May 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-11 18:16
Updated : 2026-05-16 03:04
NVD link : CVE-2026-43639
Mitre link : CVE-2026-43639
CVE.ORG link : CVE-2026-43639
JSON object : View
Products Affected
bitwarden
- server
CWE
CWE-862
Missing Authorization