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The vulnerability CVE-2026-100506 is a Deserialization of Untrusted Data flaw affecting the WP Spell Check WordPress plugin (slug wp-spell-check). In PHP, the `unserialize()` function converts a stored or transmitted string representation of an object back into an actual PHP object. When an application passes untrusted input directly to unserialize(), an attacker can craft a serialized string that instantiates arbitrary objects. If any of those objects have magic methods such as __wakeup(), __destruct(), or __toString(), the attacker can trigger unintended code paths. In the case of WP Spell Check, the plugin likely exposes an AJAX action or REST endpoint that accepts serialized data without proper validation. An authenticated attacker with minimal privileges (e.g., a subscriber) can send a crafted serialized payload to that endpoint. The payload contains a malicious object whose properties are controlled by the attacker. When the plugin deserializes the payload, the object’s magic methods execute, potentially allowing the attacker to delete arbitrary files, read sensitive data, or in some configurations achieve remote code execution. The CVSS score of 7.2 reflects a high severity because the attack vector is network‑based, requires low privileges, and can lead to a full compromise of the WordPress site. The vulnerability was published to the National Vulnerability Database on 2026‑10‑05, and at the time of writing, no official patch has been released by the plugin vendor. Users are advised to disable the plugin until a fix is available.
DailyCVE Form:
Platform: WordPress Plugin
Version: WP Spell Check (all)
Vulnerability: Object Injection
Severity: High
date: 2026-10-05
Prediction: Patch Unknown
What Undercode Say:
Fetch the latest new‑CVE CSV from the GHLists repository curl -s https://raw.githubusercontent.com/GHLists/new-cves/main/data/new-cves-2026-10-05T20-19-59-034028Z.csv | grep "CVE-2026-100506" Example output line (CSV) 2026-10-05 20:17:03,CVE-2026-100506,High,7.2,Deserialization of Untrusted Data vulnerability in WP Spell Check wp-spell-check allows Object Injection…
// Simplified example of how the vulnerable code might look $data = $_POST['spell_check_data']; $object = unserialize($data); // Unsafe deserialization
Exploit: (Educational Purposes!)
// Hypothetical PHP object injection payload for WP Spell Check
// (Do not use on production systems without authorization)
class Evil {
public $cmd = 'id';
public function __destruct() {
system($this->cmd);
}
}
$payload = serialize(new Evil());
// The payload string would be sent to the vulnerable AJAX action.
Protection: from this CVE
- Disable the WP Spell Check plugin until a patched version is released.
- Avoid passing user‑supplied data to
unserialize(); use `json_decode()` instead. - Implement input validation and capability checks on all AJAX/REST endpoints.
- Apply the principle of least privilege to WordPress user roles.
Impact:
An attacker can exploit this vulnerability to execute arbitrary code, delete files, or read sensitive information, leading to a complete takeover of the affected WordPress site.
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Sources:
Reported By: github.com
Extra Source Hub:
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