marketingfire Widget Options Plugin up to 4.2.6.1 on WordPress Render-time parser widgetopts_safe_eval_trusted post_content code injection

Summaryinfo

A vulnerability was found in marketingfire Widget Options Plugin up to 4.2.6.1 and classified as critical. Affected by this vulnerability is the function widgetopts_safe_eval_trusted of the component Render-time parser. Executing a manipulation of the argument post_content can lead to code injection. This vulnerability appears as CVE-2026-116615. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in marketingfire Widget Options Plugin up to 4.2.6.1. It has been declared as critical. This vulnerability affects the function widgetopts_safe_eval_trusted of the component Render-time parser. The manipulation of the argument post_content 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. CVE summarizes:

The Widget Options – Advanced Conditional Visibility for Gutenberg Blocks & Classic Widgets plugin for WordPress is vulnerable to Code Injection in all versions up to, and including, 4.2.6.1 via the `post_content` parameter. This is due to asymmetric parsing between the save-time strip filter (`widgetopts_strip_logic_from_blocks()`) and the render-time parser (`blockopts_filter_before_display()`): embedding an inner `<!--start_widgetopts` literal inside a JSON key causes the write-side `json_decode` to see a non-`class` key and skip stripping — persisting the payload verbatim to the database — while the render-side `str_replace` reconstitutes the key to `class`, feeding the attacker-controlled `logic` value directly into `@eval`. This makes it possible for authenticated attackers, with Author-level access and above, to inject PHP expressions that execute on every front-end page view, enabling boolean-oracle exfiltration of WordPress site configuration data — including admin email address, default role, and arbitrary `get_option`, `get_user_meta`, and `get_post_meta` values — via the plugin's allowlisted-function sandbox, which escalates to unrestricted code execution if any installed plugin extends the `widgetopts_allowed_php_functions` filter. Contributors can also exploit this vulnerability when their submitted post is later published by an administrator; notably, the injected payload executes for all site visitors, including unauthenticated users, because a trust-flag mechanism introduced in version 4.2.6 causes `widgetopts_safe_eval_trusted()` to bypass its non-admin short-circuit at every legacy render callsite. Exploitation by attackers with contributor-level access and above requires that an administrator (or editor) later publishes the contributor's submission. On a default installation, where that is not configured, the vulnerability requires attackers with author-level access and above.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-116615 since 10/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/13/2026). This vulnerability is assigned to T1059 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

Vendor

• marketingfire

Name

• Widget Options Plugin

Version

• 4.2.6.0
• 4.2.6.1

CPE 2.3info

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CPE 2.2info

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