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CVE-2026-43640

Bitwarden Server vulnerability

8.1 HIGHPublic exploitEPSS 0.71%
  1. Published11 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Bitwarden Server< 2026.4.1

Remediation

Fixed in
Bitwarden Server≥ 2026.4.1

References

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Frequently asked

Is CVE-2026-43640 being actively exploited?

CVE-2026-43640 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.71%.

How severe is CVE-2026-43640?

CVE-2026-43640 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.71% probability of exploitation.

Which products are affected by CVE-2026-43640?

Affected products include Bitwarden Server.

How do I fix CVE-2026-43640?

Upgrade affected software to a fixed version, for example Bitwarden Server 2026.4.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-43640 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.