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[GH-ISSUE #7366] Bitwarden Firefox autofill prefers custom field named Username over login username #39935

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opened 2026-07-17 20:55:25 -05:00 by GiteaMirror · 1 comment
GiteaMirror commented 2026-07-17 20:55:25 -05:00
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Originally created by @jay-tau on GitHub (Jun 23, 2026).
Original GitHub issue: https://github.com/dani-garcia/vaultwarden/issues/7366

Prerequisites

Vaultwarden Support String

Your environment (Generated via diagnostics page)

  • Vaultwarden version: v1.36.0
  • Web-vault version: v2026.4.1
  • OS/Arch: linux/x86_64
  • Running within a container: true (Base: Debian)
  • Database type: SQLite
  • Database version: 3.51.3
  • Uses config.json: false
  • Uses a reverse proxy: true
  • IP Header check: true (X-Forwarded-For)
  • Internet access: true
  • Internet access via a proxy: false
  • DNS Check: true
  • Browser/Server Time Check: true
  • Server/NTP Time Check: true
  • Domain Configuration Check: true
  • HTTPS Check: true
  • Websocket Check: true
  • HTTP Response Checks: true

Config & Details (Generated via diagnostics page)

Show Config & Details

Config:

{
  "_duo_akey": null,
  "_enable_duo": true,
  "_enable_email_2fa": false,
  "_enable_smtp": true,
  "_enable_yubico": true,
  "_icon_service_csp": "",
  "_icon_service_url": "",
  "_ip_header_enabled": true,
  "_max_note_size": 10000,
  "_smtp_img_src": "***:",
  "admin_ratelimit_max_burst": 3,
  "admin_ratelimit_seconds": 300,
  "admin_session_lifetime": 20,
  "admin_token": "***",
  "allowed_connect_src": "",
  "allowed_iframe_ancestors": "",
  "attachments_folder": "data/attachments",
  "auth_request_purge_schedule": "30 * * * * *",
  "authenticator_disable_time_drift": false,
  "data_folder": "data",
  "database_conn_init": "",
  "database_idle_timeout": 600,
  "database_max_conns": 10,
  "database_min_conns": 2,
  "database_timeout": 30,
  "database_url": "***************",
  "db_connection_retries": 15,
  "disable_2fa_remember": false,
  "disable_admin_token": false,
  "disable_icon_download": false,
  "dns_prefer_ipv6": false,
  "domain": "*****://****************",
  "domain_origin": "*****://****************",
  "domain_path": "",
  "domain_set": true,
  "duo_context_purge_schedule": "30 * * * * *",
  "duo_host": null,
  "duo_ikey": null,
  "duo_skey": null,
  "duo_use_iframe": false,
  "email_2fa_auto_fallback": false,
  "email_2fa_enforce_on_verified_invite": false,
  "email_attempts_limit": 3,
  "email_change_allowed": true,
  "email_expiration_time": 600,
  "email_token_size": 6,
  "emergency_access_allowed": true,
  "emergency_notification_reminder_schedule": "0 3 * * * *",
  "emergency_request_timeout_schedule": "0 7 * * * *",
  "enable_db_wal": true,
  "enable_websocket": true,
  "enforce_single_org_with_reset_pw_policy": false,
  "event_cleanup_schedule": "0 10 0 * * *",
  "events_days_retain": null,
  "experimental_client_feature_flags": "",
  "extended_logging": true,
  "helo_name": null,
  "hibp_api_key": null,
  "http_request_block_non_global_ips": true,
  "http_request_block_regex": null,
  "icon_blacklist_non_global_ips": true,
  "icon_blacklist_regex": null,
  "icon_cache_folder": "data/icon_cache",
  "icon_cache_negttl": 259200,
  "icon_cache_ttl": 2592000,
  "icon_download_timeout": 10,
  "icon_redirect_code": 302,
  "icon_service": "internal",
  "incomplete_2fa_schedule": "30 * * * * *",
  "incomplete_2fa_time_limit": 3,
  "increase_note_size_limit": false,
  "invitation_expiration_hours": 120,
  "invitation_org_name": "Vaultwarden",
  "invitations_allowed": true,
  "ip_header": "X-Forwarded-For",
  "job_poll_interval_ms": 30000,
  "log_file": null,
  "log_level": "info",
  "log_timestamp_format": "%Y-%m-%d %H:%M:%S.%3f",
  "login_ratelimit_max_burst": 10,
  "login_ratelimit_seconds": 60,
  "org_attachment_limit": null,
  "org_creation_users": "",
  "org_events_enabled": false,
  "org_groups_enabled": false,
  "password_hints_allowed": true,
  "password_iterations": 600000,
  "purge_incomplete_sso_auth": "0 20 0 * * *",
  "push_enabled": false,
  "push_identity_uri": "https://identity.bitwarden.com",
  "push_installation_id": "***",
  "push_installation_key": "***",
  "push_relay_uri": "https://push.bitwarden.com",
  "reload_templates": false,
  "require_device_email": false,
  "rsa_key_filename": "data/rsa_key",
  "send_purge_schedule": "0 5 * * * *",
  "sendmail_command": null,
  "sends_allowed": true,
  "sends_folder": "data/sends",
  "show_password_hint": false,
  "signups_allowed": true,
  "signups_domains_whitelist": "",
  "signups_verify": false,
  "signups_verify_resend_limit": 6,
  "signups_verify_resend_time": 3600,
  "smtp_accept_invalid_certs": false,
  "smtp_accept_invalid_hostnames": false,
  "smtp_auth_mechanism": null,
  "smtp_debug": false,
  "smtp_embed_images": true,
  "smtp_explicit_tls": null,
  "smtp_from": "",
  "smtp_from_name": "***********",
  "smtp_host": null,
  "smtp_password": null,
  "smtp_port": 587,
  "smtp_security": "starttls",
  "smtp_ssl": null,
  "smtp_timeout": 15,
  "smtp_username": null,
  "sso_allow_unknown_email_verification": false,
  "sso_audience_trusted": null,
  "sso_auth_only_not_session": false,
  "sso_authority": "",
  "sso_authorize_extra_params": "",
  "sso_callback_path": "*****://*********************************************",
  "sso_client_cache_expiration": 0,
  "sso_client_id": "",
  "sso_client_secret": "***",
  "sso_debug_tokens": false,
  "sso_enabled": false,
  "sso_master_password_policy": null,
  "sso_only": false,
  "sso_pkce": true,
  "sso_scopes": "email profile",
  "sso_signups_match_email": true,
  "templates_folder": "data/templates",
  "tmp_folder": "data/tmp",
  "trash_auto_delete_days": null,
  "trash_purge_schedule": "0 5 0 * * *",
  "use_sendmail": false,
  "use_syslog": false,
  "user_attachment_limit": null,
  "user_send_limit": null,
  "web_vault_enabled": true,
  "web_vault_folder": "web-vault/",
  "yubico_client_id": null,
  "yubico_secret_key": null,
  "yubico_server": null
}

Vaultwarden Build Version

v1.36.0

Deployment method

Other method

Custom deployment method

Hosted on PikaPods.

Reverse Proxy

PikaPods-managed reverse proxy (X-Forwarded-For according to diagnostics).

Host/Server Operating System

Linux

Operating System Version

PikaPods-managed Linux container host; diagnostics reports linux/x86_64, container base Debian.

Clients

Browser Extension

Client Version

Bitwarden Firefox extension v2026.5.1; Firefox 151.0.4; client OS Linux / CachyOS.

Steps To Reproduce

  1. In the official Bitwarden Firefox browser extension, connected to this Vaultwarden server, create or edit a login item for a website.
  2. Set the login item's username to real-user@example.com.
  3. Add a custom field of type Text named Username with value custom-field-user.
  4. Save the item and sync if necessary.
  5. Open the website login page and trigger autofill with the keyboard shortcut.

Expected Result

The website username field is filled with the login item's username value: real-user@example.com.

Actual Result

The website username field is filled with the custom field value: custom-field-user.

Logs

No Vaultwarden server errors observed during the repro. This appears to be a client/server compatibility or cipher-shape issue rather than a server exception.

Screenshots or Videos

No response

Additional Context

This was first reported to Bitwarden clients as https://github.com/bitwarden/clients/issues/21312. Bitwarden closed that issue because the reproduction was against Vaultwarden and asked for issues to be reported only when reproduced against an official Bitwarden server.

I searched existing open and closed Vaultwarden issues for this specific Username custom-field/autofill behavior and did not find a duplicate. The nearest generic autofill reports I found were unrelated, such as #6978 (iOS click-to-fill behavior).

I am filing this here because the confirmed repro is currently against Vaultwarden. It may still ultimately be client-side autofill precedence, but it would be useful to know whether Vaultwarden stores/returns the login username and custom field named Username differently from official Bitwarden in a way that triggers this behavior.

Originally created by @jay-tau on GitHub (Jun 23, 2026). Original GitHub issue: https://github.com/dani-garcia/vaultwarden/issues/7366 ### Prerequisites - [x] I have searched the existing **Closed _AND_ Open** [Issues](https://github.com/dani-garcia/vaultwarden/issues?q=is%3Aissue%20) **_AND_** [Discussions](https://github.com/dani-garcia/vaultwarden/discussions?discussions_q=) - [x] I have searched and read the [documentation](https://github.com/dani-garcia/vaultwarden/wiki/) ### Vaultwarden Support String ### Your environment (Generated via diagnostics page) * Vaultwarden version: v1.36.0 * Web-vault version: v2026.4.1 * OS/Arch: linux/x86_64 * Running within a container: true (Base: Debian) * Database type: SQLite * Database version: 3.51.3 * Uses config.json: false * Uses a reverse proxy: true * IP Header check: true (X-Forwarded-For) * Internet access: true * Internet access via a proxy: false * DNS Check: true * Browser/Server Time Check: true * Server/NTP Time Check: true * Domain Configuration Check: true * HTTPS Check: true * Websocket Check: true * HTTP Response Checks: true ### Config & Details (Generated via diagnostics page) <details><summary>Show Config & Details</summary> **Config:** ```json { "_duo_akey": null, "_enable_duo": true, "_enable_email_2fa": false, "_enable_smtp": true, "_enable_yubico": true, "_icon_service_csp": "", "_icon_service_url": "", "_ip_header_enabled": true, "_max_note_size": 10000, "_smtp_img_src": "***:", "admin_ratelimit_max_burst": 3, "admin_ratelimit_seconds": 300, "admin_session_lifetime": 20, "admin_token": "***", "allowed_connect_src": "", "allowed_iframe_ancestors": "", "attachments_folder": "data/attachments", "auth_request_purge_schedule": "30 * * * * *", "authenticator_disable_time_drift": false, "data_folder": "data", "database_conn_init": "", "database_idle_timeout": 600, "database_max_conns": 10, "database_min_conns": 2, "database_timeout": 30, "database_url": "***************", "db_connection_retries": 15, "disable_2fa_remember": false, "disable_admin_token": false, "disable_icon_download": false, "dns_prefer_ipv6": false, "domain": "*****://****************", "domain_origin": "*****://****************", "domain_path": "", "domain_set": true, "duo_context_purge_schedule": "30 * * * * *", "duo_host": null, "duo_ikey": null, "duo_skey": null, "duo_use_iframe": false, "email_2fa_auto_fallback": false, "email_2fa_enforce_on_verified_invite": false, "email_attempts_limit": 3, "email_change_allowed": true, "email_expiration_time": 600, "email_token_size": 6, "emergency_access_allowed": true, "emergency_notification_reminder_schedule": "0 3 * * * *", "emergency_request_timeout_schedule": "0 7 * * * *", "enable_db_wal": true, "enable_websocket": true, "enforce_single_org_with_reset_pw_policy": false, "event_cleanup_schedule": "0 10 0 * * *", "events_days_retain": null, "experimental_client_feature_flags": "", "extended_logging": true, "helo_name": null, "hibp_api_key": null, "http_request_block_non_global_ips": true, "http_request_block_regex": null, "icon_blacklist_non_global_ips": true, "icon_blacklist_regex": null, "icon_cache_folder": "data/icon_cache", "icon_cache_negttl": 259200, "icon_cache_ttl": 2592000, "icon_download_timeout": 10, "icon_redirect_code": 302, "icon_service": "internal", "incomplete_2fa_schedule": "30 * * * * *", "incomplete_2fa_time_limit": 3, "increase_note_size_limit": false, "invitation_expiration_hours": 120, "invitation_org_name": "Vaultwarden", "invitations_allowed": true, "ip_header": "X-Forwarded-For", "job_poll_interval_ms": 30000, "log_file": null, "log_level": "info", "log_timestamp_format": "%Y-%m-%d %H:%M:%S.%3f", "login_ratelimit_max_burst": 10, "login_ratelimit_seconds": 60, "org_attachment_limit": null, "org_creation_users": "", "org_events_enabled": false, "org_groups_enabled": false, "password_hints_allowed": true, "password_iterations": 600000, "purge_incomplete_sso_auth": "0 20 0 * * *", "push_enabled": false, "push_identity_uri": "https://identity.bitwarden.com", "push_installation_id": "***", "push_installation_key": "***", "push_relay_uri": "https://push.bitwarden.com", "reload_templates": false, "require_device_email": false, "rsa_key_filename": "data/rsa_key", "send_purge_schedule": "0 5 * * * *", "sendmail_command": null, "sends_allowed": true, "sends_folder": "data/sends", "show_password_hint": false, "signups_allowed": true, "signups_domains_whitelist": "", "signups_verify": false, "signups_verify_resend_limit": 6, "signups_verify_resend_time": 3600, "smtp_accept_invalid_certs": false, "smtp_accept_invalid_hostnames": false, "smtp_auth_mechanism": null, "smtp_debug": false, "smtp_embed_images": true, "smtp_explicit_tls": null, "smtp_from": "", "smtp_from_name": "***********", "smtp_host": null, "smtp_password": null, "smtp_port": 587, "smtp_security": "starttls", "smtp_ssl": null, "smtp_timeout": 15, "smtp_username": null, "sso_allow_unknown_email_verification": false, "sso_audience_trusted": null, "sso_auth_only_not_session": false, "sso_authority": "", "sso_authorize_extra_params": "", "sso_callback_path": "*****://*********************************************", "sso_client_cache_expiration": 0, "sso_client_id": "", "sso_client_secret": "***", "sso_debug_tokens": false, "sso_enabled": false, "sso_master_password_policy": null, "sso_only": false, "sso_pkce": true, "sso_scopes": "email profile", "sso_signups_match_email": true, "templates_folder": "data/templates", "tmp_folder": "data/tmp", "trash_auto_delete_days": null, "trash_purge_schedule": "0 5 0 * * *", "use_sendmail": false, "use_syslog": false, "user_attachment_limit": null, "user_send_limit": null, "web_vault_enabled": true, "web_vault_folder": "web-vault/", "yubico_client_id": null, "yubico_secret_key": null, "yubico_server": null } ``` </details> ### Vaultwarden Build Version v1.36.0 ### Deployment method Other method ### Custom deployment method Hosted on PikaPods. ### Reverse Proxy PikaPods-managed reverse proxy (`X-Forwarded-For` according to diagnostics). ### Host/Server Operating System Linux ### Operating System Version PikaPods-managed Linux container host; diagnostics reports linux/x86_64, container base Debian. ### Clients Browser Extension ### Client Version Bitwarden Firefox extension v2026.5.1; Firefox 151.0.4; client OS Linux / CachyOS. ### Steps To Reproduce 1. In the official Bitwarden Firefox browser extension, connected to this Vaultwarden server, create or edit a login item for a website. 2. Set the login item's username to `real-user@example.com`. 3. Add a custom field of type Text named `Username` with value `custom-field-user`. 4. Save the item and sync if necessary. 5. Open the website login page and trigger autofill with the keyboard shortcut. ### Expected Result The website username field is filled with the login item's username value: `real-user@example.com`. ### Actual Result The website username field is filled with the custom field value: `custom-field-user`. ### Logs ```text No Vaultwarden server errors observed during the repro. This appears to be a client/server compatibility or cipher-shape issue rather than a server exception. ``` ### Screenshots or Videos _No response_ ### Additional Context This was first reported to Bitwarden clients as https://github.com/bitwarden/clients/issues/21312. Bitwarden closed that issue because the reproduction was against Vaultwarden and asked for issues to be reported only when reproduced against an official Bitwarden server. I searched existing open and closed Vaultwarden issues for this specific `Username` custom-field/autofill behavior and did not find a duplicate. The nearest generic autofill reports I found were unrelated, such as #6978 (iOS click-to-fill behavior). I am filing this here because the confirmed repro is currently against Vaultwarden. It may still ultimately be client-side autofill precedence, but it would be useful to know whether Vaultwarden stores/returns the login username and custom field named `Username` differently from official Bitwarden in a way that triggers this behavior.
GiteaMirror commented 2026-07-17 20:55:43 -05:00
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@stefan0xC commented on GitHub (Jun 23, 2026):

I don't think this is Vaultwarden specific. Can't you reproduce that using the Bitwarden Cloud as backend? See https://github.com/dani-garcia/vaultwarden/wiki/Bitwarden-clients-troubleshooting for how to go about issues with a Bitwarden client.

<!-- gh-comment-id:4776381186 --> @stefan0xC commented on GitHub (Jun 23, 2026): I don't think this is Vaultwarden specific. Can't you reproduce that using the Bitwarden Cloud as backend? See https://github.com/dani-garcia/vaultwarden/wiki/Bitwarden-clients-troubleshooting for how to go about issues with a Bitwarden client.
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Reference: github-starred/vaultwarden#39935
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