Email notifications does not send Base64 encoded images #968

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opened 2026-02-04 23:30:42 +03:00 by OVERLORD · 4 comments

OVERLORD commented 2026-02-04 23:30:42 +03:00

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Originally created by @speedygonzales391 on GitHub (Mar 10, 2021).

Email notifications does not send Base64 encoded images from templates

We would like to use email templates with Base64 encoded images. So we use own templates - it works. But if we use <img src="data:image/png;base64,iVBORw...." alt="aaa" />, images are not send.

Deployment environment

Your environment (Generated via diagnostics page)

• Bitwarden_rs version: v1.19.0
• Web-vault version: v2.18.1
• Running within Docker: true
• Internet access: false
• Uses a proxy: false
• DNS Check: true
• Time Check: true
• Domain Configuration Check: true
• HTTPS Check: true
• Database type: MySQL
• Database version: 5.7.22
• Clients used:
• Reverse proxy and version:
• Other relevant information:

Config (Generated via diagnostics page)

{
  "_duo_akey": null,
  "_enable_duo": false,
  "_enable_email_2fa": true,
  "_enable_smtp": true,
  "_enable_yubico": true,
  "_ip_header_enabled": true,
  "admin_token": "***",
  "allowed_iframe_ancestors": "",
  "attachments_folder": "data/attachments",
  "authenticator_disable_time_drift": false,
  "data_folder": "data",
  "database_max_conns": 10,
  "database_url": "*****://***********:*********@***.***.***.***/*********",
  "db_connection_retries": 15,
  "disable_2fa_remember": false,
  "disable_admin_token": false,
  "disable_icon_download": false,
  "domain": "*****://**********.*****.**/",
  "domain_origin": "*****://**********.*****.**",
  "domain_path": "",
  "domain_set": true,
  "duo_host": null,
  "duo_ikey": null,
  "duo_skey": null,
  "email_attempts_limit": 3,
  "email_expiration_time": 600,
  "email_token_size": 6,
  "enable_db_wal": false,
  "extended_logging": true,
  "helo_name": null,
  "hibp_api_key": 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,
  "invitation_org_name": "***** Test",
  "invitations_allowed": true,
  "ip_header": "X-Real-IP",
  "log_file": null,
  "log_level": "Info",
  "log_timestamp_format": "%Y-%m-%d %H:%M:%S.%3f",
  "org_attachment_limit": null,
  "org_creation_users": "",
  "password_iterations": 100000,
  "reload_templates": false,
  "require_device_email": false,
  "rsa_key_filename": "data/rsa_key",
  "show_password_hint": true,
  "signups_allowed": false,
  "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_explicit_tls": false,
  "smtp_from": "**********@*****.**",
  "smtp_from_name": "Bitwarden_RS Test",
  "smtp_host": "****.*****.**",
  "smtp_password": null,
  "smtp_port": 25,
  "smtp_ssl": false,
  "smtp_timeout": 15,
  "smtp_username": null,
  "templates_folder": "data/templates",
  "use_syslog": false,
  "user_attachment_limit": null,
  "web_vault_enabled": true,
  "web_vault_folder": "web-vault/",
  "websocket_address": "0.0.0.0",
  "websocket_enabled": false,
  "websocket_port": 3012,
  "yubico_client_id": null,
  "yubico_secret_key": null,
  "yubico_server": null
}

Steps to reproduce

Use own email templates with image encoded into Base64 and tag for example
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAPUAAACzCAIAAADe0s1DAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAK/SURBVHhe7dnBbepAFEDR1OWCXA/V0IyL4ZvgJOaTBZuRMlfnbEDmLa+eZszHDbr0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZfqmTN+U6ZsyfVOmb8r0TZm+KdM3ZTP2vV0vl3VZPr4ty7Jet+PXsxGTzGS6vq/rEeBub/CU5N7jMfMwYpLJzNj3sl6eN+t2eRS5XM6PR0wymcj5+9jAb2zbEZP8WZG+j237xrIdMcmfNWnf234fXNf9QvjlXuKvLY6YZBrz9b1d16O8V88tjphkLrP1fRyK7/fB7dTdL2eJEZPMZrK+jxRfmnttccQk05mz75d3Gq+NjphkOpP1fezUp+i2y/fh+fR4xCTTme5+eWzVu593HPevnx/nFkdMMpnp+t7d33Z8RbhX+PnP4yPR/1scMclMZuwb3qVvyvRNmb4p0zdl+qZM35TpmzJ9U6ZvyvRNmb4p0zdl+qZM35TpmzJ9U6ZvyvRNmb4p0zdl+qZM35TpmzJ9U6ZvyvRNmb4p0zdl+qZM35TpmzJ9U6ZvyvRNmb4p0zdl+qZM35TpmzJ9U6ZvyvRNmb4p0zdl+qZM35TpmzJ9U6ZvyvRNmb4p0zdl+qZM35TpmzJ9U6ZvyvRNmb4p0zdl+qZM35TpmzJ9U6Zvum63f2lFcr95QrhyAAAAAElFTkSuQmCC" alt="aaa" /> and use for example Test SMTP email from Bitwarden_rs admin.

Expected behaviour

Bitwarden_rs send email with image in html message.

Actual behaviour

Images in email does not send.

Troubleshooting data

Originally created by @speedygonzales391 on GitHub (Mar 10, 2021). <!-- # ### NOTE: Please update to the latest version of bitwarden_rs before reporting an issue! This saves you and us a lot of time and troubleshooting. See: * https://github.com/dani-garcia/bitwarden_rs/issues/1180 * https://github.com/dani-garcia/bitwarden_rs/wiki/Updating-the-bitwarden-image # ### --> <!-- Please fill out the following template to make solving your problem easier and faster for us. This is only a guideline. If you think that parts are unnecessary for your issue, feel free to remove them. Remember to hide/redact personal or confidential information, such as passwords, IP addresses, and DNS names as appropriate. --> ### Email notifications does not send Base64 encoded images from templates <!-- Describe your issue here. --> We would like to use email templates with Base64 encoded images. So we use own templates - it works. But if we use `<img src="data:image/png;base64,iVBORw...." alt="aaa" />`, images are not send. ### Deployment environment ### Your environment (Generated via diagnostics page) * Bitwarden_rs version: v1.19.0 * Web-vault version: v2.18.1 * Running within Docker: true * Internet access: false * Uses a proxy: false * DNS Check: true * Time Check: true * Domain Configuration Check: true * HTTPS Check: true * Database type: MySQL * Database version: 5.7.22 * Clients used: * Reverse proxy and version: * Other relevant information: ### Config (Generated via diagnostics page) ```json { "_duo_akey": null, "_enable_duo": false, "_enable_email_2fa": true, "_enable_smtp": true, "_enable_yubico": true, "_ip_header_enabled": true, "admin_token": "***", "allowed_iframe_ancestors": "", "attachments_folder": "data/attachments", "authenticator_disable_time_drift": false, "data_folder": "data", "database_max_conns": 10, "database_url": "*****://***********:*********@***.***.***.***/*********", "db_connection_retries": 15, "disable_2fa_remember": false, "disable_admin_token": false, "disable_icon_download": false, "domain": "*****://**********.*****.**/", "domain_origin": "*****://**********.*****.**", "domain_path": "", "domain_set": true, "duo_host": null, "duo_ikey": null, "duo_skey": null, "email_attempts_limit": 3, "email_expiration_time": 600, "email_token_size": 6, "enable_db_wal": false, "extended_logging": true, "helo_name": null, "hibp_api_key": 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, "invitation_org_name": "***** Test", "invitations_allowed": true, "ip_header": "X-Real-IP", "log_file": null, "log_level": "Info", "log_timestamp_format": "%Y-%m-%d %H:%M:%S.%3f", "org_attachment_limit": null, "org_creation_users": "", "password_iterations": 100000, "reload_templates": false, "require_device_email": false, "rsa_key_filename": "data/rsa_key", "show_password_hint": true, "signups_allowed": false, "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_explicit_tls": false, "smtp_from": "**********@*****.**", "smtp_from_name": "Bitwarden_RS Test", "smtp_host": "****.*****.**", "smtp_password": null, "smtp_port": 25, "smtp_ssl": false, "smtp_timeout": 15, "smtp_username": null, "templates_folder": "data/templates", "use_syslog": false, "user_attachment_limit": null, "web_vault_enabled": true, "web_vault_folder": "web-vault/", "websocket_address": "0.0.0.0", "websocket_enabled": false, "websocket_port": 3012, "yubico_client_id": null, "yubico_secret_key": null, "yubico_server": null } ``` ### Steps to reproduce <!-- Tell us how to reproduce this issue. What parameters did you set (differently from the defaults) and how did you start bitwarden_rs? --> Use own email templates with image encoded into Base64 and tag for example `<img src="data:image/png;base64,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" alt="aaa" />` and use for example Test SMTP email from Bitwarden_rs admin. ### Expected behaviour <!-- Tell us what you expected to happen --> Bitwarden_rs send email with image in html message. ### Actual behaviour <!-- Tell us what actually happened --> Images in email does not send. ### Troubleshooting data <!-- Share any log files, screenshots, or other relevant troubleshooting data --> 

OVERLORD closed this issue 2026-02-04 23:30:44 +03:00

OVERLORD commented 2026-02-04 23:30:50 +03:00

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@daniel-qima commented on GitHub (Mar 10, 2021):

try to login /admin and check the General Setting > Domain URL, make sure the value is your domain.

@daniel-qima commented on GitHub (Mar 10, 2021): try to login /admin and check the General Setting > Domain URL, make sure the value is your domain. 

OVERLORD commented 2026-02-04 23:30:52 +03:00

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@speedygonzales391 commented on GitHub (Mar 10, 2021):

Yes Domain URL is set

@speedygonzales391 commented on GitHub (Mar 10, 2021): Yes Domain URL is set

OVERLORD commented 2026-02-04 23:30:58 +03:00

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@paolobarbolini commented on GitHub (Mar 11, 2021):

Hello, I'm not part of the bitwarden_rs team, but I do maintain the lettre crate, which bitwarden_rs uses for sending emails.

Assuming the template has been written correctly, one way of debugging this issue could be to download the raw email from your email client as an .eml file and attaching it here.

Before posting the .eml file open it with a text editor and remove all of the private email headers. Basically the part we are interested in begins here, everything that comes before should be erased:

One last note: since the SMTP test email body contains the instance url, to avoid posting it publicly you could temporarily configure a different url as the instance url.

@paolobarbolini commented on GitHub (Mar 11, 2021): Hello, I'm not part of the bitwarden_rs team, but I do maintain the `lettre` crate, which bitwarden_rs uses for sending emails. **Assuming the template has been written correctly**, one way of debugging this issue could be to download the raw email from your email client as an `.eml` file and attaching it here. Before posting the `.eml` file open it with a text editor and remove all of the private email headers. Basically the part we are interested in begins here, everything that comes before should be erased:  One last note: since the SMTP test email body contains the instance url, to avoid posting it publicly you could temporarily configure a different url as the instance url.

OVERLORD commented 2026-02-04 23:31:01 +03:00

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@BlackDex commented on GitHub (Mar 11, 2021):

I just did a test my self, and it DOES add the image, only Google/Gmail if filtering this during the view in the web-interface.
I also tested this on Outlook365, and it works there too.

This is on gmail:

This is that same mail on thunderbird:

@BlackDex commented on GitHub (Mar 11, 2021): I just did a test my self, and it DOES add the image, only Google/Gmail if filtering this during the view in the web-interface. I also tested this on Outlook365, and it works there too. This is on gmail:  This is that same mail on thunderbird: 

OVERLORD referenced this issue 2026-02-05 04:59:31 +03:00

[PR #1014] [CLOSED] Run bitwarden-rs as non-root user #2825

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Reference: starred/vaultwarden#968