Bitwarden Server before 2026.10.1 on Entity Framework backends contains an authorization bypass vulnerability that allows organization…
CVE-2026-119414
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.
Assessment
- CVSS
- 5.3 (v4.0)
- Severity
- Medium
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 30 October 2026
- Last updated
- 30 October 2026
- Weakness
- CWE-863
- Assigner
- disclosure@vulncheck.com
CVSS vectorCVSS: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
At the source
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/CiphersController.cs#L355
- https://github.com/bitwarden/server/blob/v2026.10.0/src/Infrastructure.EntityFramework/Vault/Repositories/CipherRepository.cs#L112
- https://github.com/bitwarden/server/commit/9030c42bf7d8f9ac2ff9fee85c39588d5eb81499
- 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-authorization-bypass-via-post-api-ciphers-create
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