CVE-2026-43639

HIGH8.9

Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients

Published May 11, 2026

Modified 1 weeks ago

Details

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

FIX

https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d

WEB

https://github.com/bitwarden/server/pull/7372

WEB

https://github.com/bitwarden/server/releases/tag/v2026.4.0

DETECTION

https://sanjokkarki.com.np/blog/bitwarden-provider-takeover

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-43639

ADVISORY