CVE-2026-27898

Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwardenrs. Prior to version 1.35.4, an authenticated regular user can specify another user’s cipherid and call "PUT /api/ciphers/id/partial" Even though the standard retrieval API correctly denies access...

GHSA-W9F8-M526-H7FH Vaultwarden has Unauthorized Access via Partial Update API on Another User’s Cipher

Summary In the test environment, it was confirmed that an authenticated regular user can specify another user’s cipherid and call: PUT /api/ciphers/id/partial Even though the standard retrieval API correctly denies access to that cipher, the partial update endpoint returns 200 OK and exposes...