CVE-2026-43640Public exploitNetwork attack vector

SCIM key disclosure via skipped password verification

Published May 11, 2026 · Updated May 11, 2026

Authentication bypass in Bitwarden Server before 2026.4.1 allows remote authenticated users to retrieve or rotate a SCIM API key. OrganizationsController short-circuits VerifySecretAsync for the SCIM key type, accepting any nonempty secret and returning or replacing the key. Access requires a valid session with ManageScim permission on a Teams or Enterprise organization; the key permits out-of-session user and group provisioning.

CVSS severity8.6
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Bitwarden Server before 2026.4.1 allows remote authenticated users to retrieve or rotate a SCIM API key. OrganizationsController short-circuits VerifySecretAsync for the SCIM key type, accepting any nonempty secret and returning or replacing the key. Access requires a valid session with ManageScim permission on a Teams or Enterprise organization; the key permits out-of-session user and group provisioning.

The record

CVE
CVE-2026-43640
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Bitwarden
Product
Bitwarden Server
Classifications
CWE-303, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bitwarden · Bitwarden Serverversion=0 <2026.4.1

Published CVSS scores

8.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
8.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-303Incorrect Implementation of Authentication Algorithm
T1528Steal Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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