CVE-2026-43640

Name: CVE-2026-43640
Creator: NVD / NIST
Published: 2026-05-11T18:16:37.11+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2026-43640 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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.. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS 4.0

8.6/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.50%

39.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-303

Affected Software

Vendor	Product	Versions
Bitwarden	Server	< 2026.4.1

References

https://github.com/bitwarden/server/commit/eb251d9bf80724c87b187661783b9354d1784083Patch
https://github.com/bitwarden/server/pull/7403Issue Tracking, Patch
https://github.com/bitwarden/server/releases/tag/v2026.4.1Release Notes
https://sanjokkarki.com.np/blog/bitwarden-scim-key-bypassExploit, Third Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-scim-api-keyThird Party Advisory

Timeline

Published: May 11, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-43640?

How severe is CVE-2026-43640?

CVE-2026-43640 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2026-43640?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-43640?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST