CVE-2026-43638

Published: May 11, 2026Modified: May 16, 2026

5.3

Vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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

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CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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:XShow less

Source: disclosure@vulncheck.com (Secondary)

Description

Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via `POST /ciphers/import-organization` by submitting an empty `collections` array, which causes the server-side permission check to be skipped.

Affected (1)

Products: Bitwarden: Server

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Bitwarden Server	Before 2026.4.1

Related CWEs

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

References (5)

https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758

Source: disclosure@vulncheck.com

Patch

https://github.com/bitwarden/server/pull/7394

Source: disclosure@vulncheck.com

Issue TrackingPatch

https://github.com/bitwarden/server/releases/tag/v2026.4.1

Source: disclosure@vulncheck.com

Release Notes

https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass

Source: disclosure@vulncheck.com

ExploitThird Party Advisory

https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import

Source: disclosure@vulncheck.com

Third Party Advisory

Timeline

No history available yet.