SSL Zen Plugin up to 4.7.42 on WordPress getMessages uri/host cross site scripting

Summaryinfo

A vulnerability was found in SSL Zen Plugin up to 4.7.42. It has been declared as problematic. Affected is the function ssl_zen_messages::getMessages. Executing a manipulation of the argument uri/host can lead to cross site scripting. This vulnerability is registered as CVE-2026-17577. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in SSL Zen Plugin up to 4.7.42. This vulnerability affects the function ssl_zen_messages::getMessages. The manipulation of the argument uri/host with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

The SSL Zen plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'uri' (and 'host') parameters in versions up to, and including, 4.7.42. The ssl_zen_messages::getMessages() function builds the 'token_missmatch' message using base64_decode(sanitize_text_field($_REQUEST['uri'])) and (optionally) base64_decode(sanitize_text_field($_REQUEST['host'])). sanitize_text_field() cannot strip HTML/JavaScript that is hidden inside a base64-encoded blob, and the resulting decoded raw HTML is echoed unescaped by showMessage() . This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-17577 since 07/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Name

• SSL Zen Plugin

Version

• 4.7.0
• 4.7.1
• 4.7.2
• 4.7.3
• 4.7.4
• 4.7.5
• 4.7.6
• 4.7.7
• 4.7.8
• 4.7.9
• 4.7.10
• 4.7.11
• 4.7.12
• 4.7.13
• 4.7.14
• 4.7.15
• 4.7.16
• 4.7.17
• 4.7.18
• 4.7.19
• 4.7.20
• 4.7.21
• 4.7.22
• 4.7.23
• 4.7.24
• 4.7.25
• 4.7.26
• 4.7.27
• 4.7.28
• 4.7.29
• 4.7.30
• 4.7.31
• 4.7.32
• 4.7.33
• 4.7.34
• 4.7.35
• 4.7.36
• 4.7.37
• 4.7.38
• 4.7.39
• 4.7.40
• 4.7.41
• 4.7.42

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