This article is a part of our Vulnerability Database (back to index)
Cross-site Scripting occurrences in Ultimate Member
The Ultimate Member plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Biography field featured on individual user profile pages due to insufficient input sanitization and output escaping that allows users to encode malicious web scripts with HTML encoding that is reflected back on the page. This affects versions up to, and including, 2.3.2. Please note this issue was partially fixed in version 2.3.2 then subsequently fully patched in version 2.3.3. (2022-06-13, CVE-2022-1208)
The Ultimate Member – User Profile, User Registration, Login & Membership Plugin WordPress plugin before 2.1.20 did not properly sanitise, validate or encode the query string when generating a link to edit user's own profile, leading to an authenticated reflected Cross-Site Scripting issue. Knowledge of the targeted username is required to exploit this, and attackers would then need to make the related logged in user open a malicious link. (2021-05-24, CVE-2021-24306)
The ultimate-member plugin before 2.0.4 for WordPress has XSS. (2019-08-12, CVE-2018-20965)
The ultimate-member plugin before 2.0.52 for WordPress has XSS during an account upgrade. (2019-08-12, CVE-2019-14947)
The ultimate-member plugin before 2.0.52 for WordPress has XSS related to UM Roles create and edit operations. (2019-08-12, CVE-2019-14946)
The ultimate-member plugin before 2.0.54 for WordPress has XSS. (2019-08-12, CVE-2019-14945)
Multiple cross-site scripting (XSS) vulnerabilities in includes/core/um-actions-login.php in the "Ultimate Member - User Profile & Membership" plugin before 2.0.28 for WordPress allow remote attackers to inject arbitrary web script or HTML via the "Primary button Text" or "Second button text" field. (2018-10-09, CVE-2018-17866)
The Ultimate Member (aka ultimatemember) plugin before 2.0.18 for WordPress has XSS via the wp-admin settings screen. (2018-07-04, CVE-2018-13136)
Cross-site scripting vulnerability in Ultimate Member plugin prior to version 2.0.4 for WordPress allows remote attackers to inject arbitrary web script or HTML via unspecified vectors. (2018-05-14, CVE-2018-0585)
core/lib/upload/um-file-upload.php in the UltimateMember plugin 2.0 for WordPress has a cross-site scripting vulnerability because it fails to properly sanitize user input passed to the $temp variable. (2018-02-16, CVE-2018-6944)
Why Cross-site Scripting can be dangerous
Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.
The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:
https://server.com/confirmation?message=Transaction+Complete
what results in:
<span>Confirmation: Transaction Complete</span>
In that case the message can be modified to become a valid Javascript code, e.g.:
https://server.com/confirmation?message=<script>dangerous javascript code here</script>
and it will be executed locally by the user's browser with full access to the user's personal application/browser data:
<span>Confirmation: <script>dangerous javascript code here</script></span>