CVE-2026-43638 PUBLISHED

Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import

Assigner: VulnCheck
Reserved: 01.05.2026 Published: 11.05.2026 Updated: 11.05.2026

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.

CVSS 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
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 5.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	bitwarden
Product	server
Versions	Default: affected affected from 0 to 2026.4.1 (excl.)

CVE-2026-43638 PUBLISHED

Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import

Metrics

Product Status

Credits

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Problem Types