WordPress Email Template Designer – WP HTML Mail plugin versions 3.0.9 and below suffer from a cross site scripting vulnerability.
advisories | CVE-2022-0218
Exploit makes it possible for unauthenticated attackers to achieve complete site takeover.
We sent the full disclosure details to the developer on January 10, 2022, after multiple attempts to contact the developer and eventually receiving a response. The developer quickly acknowledged the report and released a patch on January 13, 2022.
We strongly recommend ensuring that your site has been updated to the latest patched version of “WordPress Email Template Designer – WP HTML Mail”, which is version 3.1 at the time of this publication.
This email content has also been published on our blog and you're welcome to post a comment there if you'd like to join the conversation. (https://email.wordfence.com/e3t/Btc/GC+113/cwG7R04/VWHDpL75Z3_XW4BV8g54nSzDBW7RdXLG4DvH44N31NNzS5js6pV3Zsc37CgClmW2MbXKP1qGwNjW4jBH7-6ZVxShW6Lvyzw7xS90wW7Pj_kV20YJL6W9gr1v15wqdHCW62mCFw6CgLmDN37XHLx8BCshW41WbRV7-4L_gW3bxWBV25mHz1W3KMc066ZhQSYW1LvgN42411V8W55h1_H6hxhTxW2bRqLF47PRK_W5lgzmq1MSksKVvWl-B5Q4pBNW359SM860B8RxN1n59qWGtQttW2DlkJ64tZCVvV9BvD_2ylV4mW71kLBZ47rgbnW58XHc-5jBt2sW26BWFT1cCD6xW7vlbvr7t7-F3N5_TslrJMNvZW71ydcY6NmCzRW4pzKQ52TkMLXW15LPKz1KqSqqW8B3YpV8wxdBQW1b_h1b69r2gHW6D8PdB3GLMMfW6s3jhD5HPY5XW1xR0fr79Sb6B31Mp1 ) Or you can read the full post in this email.
Description: Unprotected REST-API Endpoint to Unauthenticated Stored Cross-Site Scripting and Data Modification
Affected Plugin: WordPress Email Template Designer – WP HTML Mail
Plugin Slug: wp-html-mail
Plugin Developer: codemiq
Affected Versions: <= 3.0.9
CVE ID: CVE-2022-0218
CVSS Score: 8.3 (High)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Researcher/s: Chloe Chamberland
Fully Patched Version: 3.1
WP HTML Mail is a WordPress plugin developed to make designing custom emails simpler for WordPress site owners. It is compatible with various WordPress plugins like WooCommerce, Ninja Forms, BuddyPress, and more. The plugin registers two REST-API routes which are used to retrieve email template settings and update email template settings. Unfortunately, these were insecurely implemented making it possible for unauthenticated users to access these endpoints.
More specifically, the plugin registers the /themesettings endpoint, which calls the saveThemeSettings function or the getThemeSettings function depending on the request method. The REST-API endpoint did use the permission_callback function, however, it was set to __return_true which meant that no authentication was required to execute the functions. Therefore, any user had access to execute the REST-API endpoint to save the email’s theme settings or retrieve the email's theme settings.
[Please read the full article here (https://email.wordfence.com/e3t/Btc/GC+113/cwG7R04/VWHDpL75Z3_XW4BV8g54nSzDBW7RdXLG4DvH44N31NNzS5js6pV3Zsc37CgClmW2MbXKP1qGwNjW4jBH7-6ZVxShW6Lvyzw7xS90wW7Pj_kV20YJL6W9gr1v15wqdHCW62mCFw6CgLmDN37XHLx8BCshW41WbRV7-4L_gW3bxWBV25mHz1W3KMc066ZhQSYW1LvgN42411V8W55h1_H6hxhTxW2bRqLF47PRK_W5lgzmq1MSksKVvWl-B5Q4pBNW359SM860B8RxN1n59qWGtQttW2DlkJ64tZCVvV9BvD_2ylV4mW71kLBZ47rgbnW58XHc-5jBt2sW26BWFT1cCD6xW7vlbvr7t7-F3N5_TslrJMNvZW71ydcY6NmCzRW4pzKQ52TkMLXW15LPKz1KqSqqW8B3YpV8wxdBQW1b_h1b69r2gHW6D8PdB3GLMMfW6s3jhD5HPY5XW1xR0fr79Sb6B31Mp1 ) to view this code snippet.]
As always, cross-site scripting vulnerabilities can be used to inject code that can add new administrative users, redirect victims to malicious sites, inject backdoors into theme and plugin files, and so much more. Combined with the fact that the vulnerability can be exploited by attackers with no privileges on a vulnerable site, this means that there is a high chance that unauthenticated attackers could gain administrative user access on sites running the vulnerable version of the plugin when successfully exploited. As such, we strongly recommend that you verify that your site is running the most up to date version of the plugin immediately.
December 23, 2021 – Conclusion of the plugin analysis that led to the discovery of a Stored Cross-Site Scripting Vulnerability in the “WordPress Email Template Designer – WP HTML Mail” plugin. We develop and release a firewall rule to protect Wordfence users. Wordfence Premium users receive this rule immediately. We attempt to initiate contact with the developer.
January 4, 2022 – We send an additional outreach attempt to the developer.
January 10, 2022 – The developer confirms the inbox for handling the discussion. We send over the full disclosure details.
January 11, 2022 – The developer acknowledges the report and indicates that they will work on a fix.
January 13, 2022 – A fully patched version of the plugin is released as version 3.1.
January 22, 2022 – The firewall rule becomes available to free Wordfence users.
In today’s post, we detailed a flaw in the “WordPress Email Template Designer – WP HTML Mail” plugin that made it possible for unauthenticated attackers to inject malicious web scripts that would execute whenever a site owner accessed the mail editor area plugin, which could lead to complete site compromise. This flaw has been fully patched in version 3.1.
We recommend that WordPress site owners immediately verify that their site has been updated to the latest patched version available, which is version 3.1 at the time of this publication.