What’s Vulnerable › Vulnerabilities

CVE-2026-43640: Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-11 · updated 2026-10-26
• Weakness: CWE-303

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.

Affected products

• bitwarden server: before 2026.4.1 — fixed in 2026.4.1

How to fix

Upgrade to a fixed version: bitwarden server 2026.4.1. Check the vendor advisory for mitigations.

References

• https://github.com/bitwarden/server/commit/eb251d9bf80724c87b187661783b9354d1784083
• https://github.com/bitwarden/server/pull/7403
• https://github.com/bitwarden/server/releases/tag/v2026.4.1
• https://sanjokkarki.com.np/blog/bitwarden-scim-key-bypass
• https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-scim-api-key

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