Logo
-

Byte Open Security

(ByteOS Network)

Log In

Sign Up

ByteOS

Security
Vulnerability Details
Registries
Custom Views
Weaknesses
Attack Patterns
Filters & Tools
CVE Vulnerability Details :
CVE-2026-43639
PUBLISHED
More InfoOfficial Page
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
View Known Exploited Vulnerability (KEV) details
Published At-11 May, 2026 | 17:14
Updated At-11 May, 2026 | 19:14
Rejected At-
▼CVE Numbering Authority (CNA)
Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients

Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organization to their provider via `POST /providers/{providerId}/clients/existing`, resulting in takeover of the target organization; self-hosted installations are unaffected as this endpoint is restricted to Cloud via SelfHosted(NotSelfHostedOnly = true).

Affected Products
Vendor
bitwarden
Product
server
Repo
https://github.com/bitwarden/server
Default Status
affected
Versions
Affected
  • From 0 before 2026.4.0 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-862Missing Authorization
Type: CWE
CWE ID: CWE-862
Description: Missing Authorization
Metrics
VersionBase scoreBase severityVector
4.08.9HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
3.18.0HIGH
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Version: 4.0
Base score: 8.9
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Version: 3.1
Base score: 8.0
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Sanjok Karki
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://sanjokkarki.com.np/blog/bitwarden-provider-takeover
technical-description
exploit
https://github.com/bitwarden/server/releases/tag/v2026.4.0
release-notes
https://github.com/bitwarden/server/pull/7372
issue-tracking
https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d
patch
https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients
third-party-advisory
Hyperlink: https://sanjokkarki.com.np/blog/bitwarden-provider-takeover
Resource:
technical-description
exploit
Hyperlink: https://github.com/bitwarden/server/releases/tag/v2026.4.0
Resource:
release-notes
Hyperlink: https://github.com/bitwarden/server/pull/7372
Resource:
issue-tracking
Hyperlink: https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d
Resource:
patch
Hyperlink: https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found