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...

CVE-2026-27898 Vaultwarden: Unauthorized Access via Partial Update API on Another User’s Cipher

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...

CVE-2026-27898

Vaultwarden (unofficial Bitwarden-compatible server) is affected by CVE-2026-27898 prior to version 1.35.4. An authenticated regular user can specify another user’s cipher_id and call PUT /api/ciphers/{id}/partial; the endpoint returns 200 OK and exposes cipherDetails (name, notes, data, secureNo...

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...

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...