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NVD Vulnerability Details :
CVE-2026-43639
Analyzed
More InfoOfficial Page
Source-disclosure@vulncheck.com
View Known Exploited Vulnerability (KEV) details
Published At-11 May, 2026 | 18:16
Updated At-16 May, 2026 | 03:04

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).

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.9HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Secondary3.18.0HIGH
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Primary3.19.1CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Type: Secondary
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
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
Type: Primary
Version: 3.1
Base score: 9.1
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CPE Matches
bitwarden
bitwarden
>>server>>Versions before 2026.4.0(exclusive)
cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-862Primarydisclosure@vulncheck.com
CWE ID: CWE-862
Type: Primary
Source: disclosure@vulncheck.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1ddisclosure@vulncheck.com
Patch
https://github.com/bitwarden/server/pull/7372disclosure@vulncheck.com
Issue Tracking
Patch
https://github.com/bitwarden/server/releases/tag/v2026.4.0disclosure@vulncheck.com
Release Notes
https://sanjokkarki.com.np/blog/bitwarden-provider-takeoverdisclosure@vulncheck.com
Exploit
Third Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clientsdisclosure@vulncheck.com
Third Party Advisory
Hyperlink: https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d
Source: disclosure@vulncheck.com
Resource:
Patch
Hyperlink: https://github.com/bitwarden/server/pull/7372
Source: disclosure@vulncheck.com
Resource:
Issue Tracking
Patch
Hyperlink: https://github.com/bitwarden/server/releases/tag/v2026.4.0
Source: disclosure@vulncheck.com
Resource:
Release Notes
Hyperlink: https://sanjokkarki.com.np/blog/bitwarden-provider-takeover
Source: disclosure@vulncheck.com
Resource:
Exploit
Third Party Advisory
Hyperlink: https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients
Source: disclosure@vulncheck.com
Resource:
Third Party Advisory
Change History
0Changes found
Details not found