EUVD-2026-88469
GHSA-3h53-mhw6-2896
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable AJAX with Subscriber auth (PR:L); AC:H because exploitation depends on a POP chain from a separately installed extension outside attacker control; full C/I/A if such a chain exists.
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
Lifecycle Timeline
2DescriptionCVE.org
The ConvertPlus plugin for WordPress is vulnerable to Deserialization of Untrusted Data in all versions up to, and including, 3.6.3 via the style parameter of the cp_display_preview_modal AJAX action. The vulnerability exists because the action's nonce guard is gated behind an isset() check and fails open when the cp_admin_page_nonce parameter is omitted entirely, no capability check is performed on the callback, and sanitize_text_field() - applied to the $style value before it is concatenated directly into a shortcode string evaluated by do_shortcode() - does not strip shortcode delimiters, allowing an attacker to inject a second, fully attacker-controlled [smile_modal] invocation that causes smile_modal_popup() to pass attacker-supplied base64-decoded bytes to maybe_unserialize() with no allowed_classes restriction. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject a PHP object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
AnalysisAI
PHP object injection in the ConvertPlus WordPress plugin (all versions through 3.6.3) allows any authenticated attacker at Subscriber level or above to reach the cp_display_preview_modal AJAX action, bypass its nonce guard simply by omitting the cp_admin_page_nonce parameter (the isset() check fails open and no capability check is performed), and inject a second attacker-controlled [smile_modal] shortcode via the style parameter that ultimately feeds attacker-supplied base64-decoded bytes into maybe_unserialize() with no allowed_classes restriction. The object-injection primitive is inert by itself - ConvertPlus ships no usable POP gadget chain - so real impact such as arbitrary file deletion, sensitive data disclosure, or code execution requires a separate installed plugin or theme that provides a compatible chain. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated account at Subscriber level or above on a site running ConvertPlus <=3.6.3, and the attacker must omit the cp_admin_page_nonce parameter entirely so the isset()-gated nonce guard fails open (there is no capability check on the callback). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals conflict on real-world severity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch or fixed version was identified at time of analysis, so the primary action is to deactivate and remove ConvertPlus until an update is published and verified; re-check the vendor site (https://convertpro.net) and the Wordfence advisory (https://www.wordfence.com/threat-intel/vulnerabilities/id/286b4dde-974d-4bb5-8a7e-57c849beaab1?source=cve) for a patched release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every WordPress instance running ConvertPlus at version 3.6.3 or earlier and, where the plugin is not business-critical, deactivate and remove it; where it must remain online, disable or tightly restrict public user registration so untrusted parties cannot obtain Subscriber accounts, deploy a WAF rule blocking requests to the cp_display_preview_modal AJAX action or any request whose style parameter contains smile_modal shortcode content, and review web server and audit logs for authenticated requests to that action that omit the cp_admin_page_nonce parameter. …
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External POC / Exploit Code
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