CVE-2026-119414

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.

Metrics

CVSS 3.1

4.3 (MEDIUM) Score source: CNA CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS 4.0

5.3 (MEDIUM) Score source: CNA 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/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

EPSS — exploit probability

0% (percentile: 30) as of 1 November 2026

CWE

CWE-863

References

• https://abraxaslabs.tech/research/bitwarden-cipher-create-acl
• https://github.com/bitwarden/server
• https://github.com/bitwarden/server/blob/v2026.10.0/src/Api/Vault/Controllers/C…
• https://github.com/bitwarden/server/blob/v2026.10.0/src/Infrastructure.EntityFr…
• https://github.com/bitwarden/server/commit/9030c42bf7d8f9ac2ff9fee85c39588d5eb8…
• https://github.com/bitwarden/server/pull/8482
• https://github.com/bitwarden/server/releases/tag/v2026.10.1
• https://www.vulncheck.com/advisories/bitwarden-server-before-2026.10.1-authoriz…