wpeverest User Registration & Membership Plugin up to 5.2.8 on WordPress Smart Tags UR_Smart_Tags::process referrer_url code injection

Summaryinfo

A vulnerability identified as critical has been detected in wpeverest User Registration & Membership Plugin up to 5.2.8. The impacted element is the function UR_Smart_Tags::process of the component Smart Tags. This manipulation of the argument referrer_url causes code injection. The identification of this vulnerability is CVE-2026-92798. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in wpeverest User Registration & Membership Plugin up to 5.2.8. It has been declared as critical. Affected by this vulnerability is the function UR_Smart_Tags::process of the component Smart Tags. The manipulation of the argument referrer_url with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The User Registration & Membership plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 5.2.8 This is due to insufficient input sanitization in the 'referrer_url' branch of UR_Smart_Tags::process(), where the attacker-controlled HTTP_REFERER header is only passed through sanitize_text_field() — which does not strip WordPress shortcode delimiters — before being substituted into a Content Restriction message that is subsequently executed via apply_shortcodes()/do_shortcode(). This makes it possible for unauthenticated attackers to execute arbitrary registered shortcodes on any restricted page whose message uses the supported {{referrer_url}} smart tag.

The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-92798 since 09/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/17/2026). MITRE ATT&CK project uses the attack technique T1059 for this issue.

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

Vendor

• wpeverest

Name

• User Registration & Membership Plugin

Version

• 5.2.0
• 5.2.1
• 5.2.2
• 5.2.3
• 5.2.4
• 5.2.5
• 5.2.6
• 5.2.7
• 5.2.8

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CPE 2.2info

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