CVE-2026-57520Public exploitNetwork attack vector

Admin account removal via missing bulk authorization

Published Jun 25, 2026 · Updated Jun 25, 2026

Missing authorization in Bitwarden Server before 2026.5.0 allows remote authenticated users to remove organization Admin accounts. RemoveOrganizationUserCommand.RemoveUsersAsync accepts Admin organization-user IDs from the bulk DELETE path without applying the Custom-to-Admin role check enforced by single-user removal. Custom organization users need ManageUsers permission and an Admin member ID; exploitation removes one or more Admin accounts from that organization.

CVSS severity7.1
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Bitwarden Server before 2026.5.0 allows remote authenticated users to remove organization Admin accounts. RemoveOrganizationUserCommand.RemoveUsersAsync accepts Admin organization-user IDs from the bulk DELETE path without applying the Custom-to-Admin role check enforced by single-user removal. Custom organization users need ManageUsers permission and an Admin member ID; exploitation removes one or more Admin accounts from that organization.

The record

CVE
CVE-2026-57520
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Bitwarden
Product
Bitwarden Server
Classifications
CWE-862, T1531
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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 <2026.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bitwarden · Bitwarden Serverversion=0 <2026.5.0

Published CVSS scores

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
7.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

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-862Missing Authorization
T1531Account Access Removal

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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