Bitwarden Server before 2026.10.1 Authorization Bypass via POST /api/ciphers/create

Advisories

Bitwarden Server before 2026.10.1 Authorization Bypass via POST /api/ciphers/create

Severity: medium
Date: 10/30/2026
Affecting: server >= 0, < 2026.10.1
CVE: CVE-2026-119414
CWE: CWE-863 Incorrect Authorization
CVSS: 5.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
References: https://github.com/bitwarden/server/commit/9030c42bf7d8f9ac2ff9fee85c39588d5eb81499
https://github.com/bitwarden/server/pull/8482
https://github.com/bitwarden/server/blob/v2026.10.0/src/Infrastructure.EntityFramework/Vault/Repositories/CipherRepository.cs#L112
https://github.com/bitwarden/server/blob/v2026.10.0/src/Api/Vault/Controllers/CiphersController.cs#L355
server v2026.10.1 Release Notes
https://abraxaslabs.tech/research/bitwarden-cipher-create-acl
https://github.com/bitwarden/server
Credit: Abraxas Labs, Nik Gilmore
Description: Bitwarden Server before 2026.10.1 on Entity Framework backends contains an authorization bypass vulnerability that allows organization members to add ciphers to collections they cannot edit. Attackers can call POST /api/ciphers/create, where a nulled UserId is treated as administrative, to inject vault items synced to read-only or inaccessible collections' members.

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