CVE-2026-43640 Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key
Authenticated users with SCIM privileges can bypass master-password re-authentication to retrieve or rotate organization SCIM API keys.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-43640?
CVE-2026-43640 is a high-severity authentication bypass vulnerability in bitwarden server, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Bitwarden Server prior to v2026.4.1 does not require master-password re-authentication when retrieving or rotating an organization's SCIM API key, allowing an authenticated user with SCIM management privileges to obtain the key using only a valid session.
Weakness: CWE-303
Which versions are affected by CVE-2026-43640?
It affects 1 product.
Products include Bitwarden Server.
How do I fix CVE-2026-43640?
No fix has been published for CVE-2026-43640 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-43640 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43640 exists.
Other vulnerabilities in bitwarden server
- CVE-2026-60104 Bitwarden Server < 2026.6.0 Authorization Bypass via Admin Auth Request
- CVE-2026-43639 Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients
- CVE-2020-15879 Server-side request forgery in n/a
- CVE-2019-19766 Weak cryptography in n/a
- CVE-2026-57520 Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint
Sources
Also known as GHSA-6736-x63f-c628.