CVE-2026-43640

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.

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CVSS v3.1 Score

8.1

HIGH

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

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.32%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-303 CWE-303

Affected Products

Vendor	Product	Versions
bitwarden	server	< 2026.4.1

References

Advisories & Patches

https://github.com/bitwarden/server/commit/eb251d9bf80724c87b187661783b9354d1784083 https://github.com/bitwarden/server/pull/7403

Exploits

https://sanjokkarki.com.np/blog/bitwarden-scim-key-bypass

Other References

https://github.com/bitwarden/server/releases/tag/v2026.4.1 https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-scim-api-key

Frequently Asked Questions

What is CVE-2026-43640? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-43640? +

CVE-2026-43640 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-43640? +

CVE-2026-43640 affects products from bitwarden, specifically: server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-43640? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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