Widget Options <= 4.2.6.1 - Authenticated (Contributor+) Code Injection via 'post_content' Parameter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116615
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 10:17:25 UTC
Updated2026-11-13 20:17:51 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-94 | CWE-94 CWE-94 Improper Control of Generation of Code

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Marketingfire Widget Options Advanced Conditional Visibility For Gutenberg Blocks Classic Widgets affected 4.2.6.1 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/widget-options/tags/4.2.6.1/includes/widgets/gutenber... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/widget-options/tags/4.2.6.1/includes/extras.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/widget-options/tags/4.2.6.1/includes/widgets/gutenber... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/widget-options/tags/4.2.6.1/includes/widgets/gutenber... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/3f5e4431-2789-47c8-81ce-e9f67... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/widget-options/tags/4.2.7/includes/widgets/gutenberg/... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Wordfence PRISM (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-26T17:15:25.000ZVendor Notified
CNA2026-11-12T20:59:16.000ZDisclosed

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