CVE-2026-97278
Deferred Deferred - Pending Action

Polylang Plugin Object Injection via Untrusted Data Deserialization

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Patchstack

Description
Deserialization of Untrusted Data vulnerability in WP SYNTEX Polylang polylang allows Object Injection.This issue affects Polylang: from n/a through 3.8.9.

CVSS Scores

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Meta Information

Published
2026-10-14
Last Modified
2026-10-14
Generated
2026-10-19
AI Q&A
2026-10-15
EPSS Evaluated
2026-10-18
NVD
CVE-2026-97278
EUVD
EUVD-2026-101009

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
WP SYNTEX Polylang 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

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Executive Summary

This vulnerability is a PHP Object Injection flaw in the WordPress Polylang plugin versions 3.8.9 and earlier. It allows attackers to manipulate data processing on the server by deserializing untrusted data, potentially leading to harmful actions like code execution or data theft.

Detection Guidance

Detecting this vulnerability requires checking the installed version of the Polylang plugin. Use commands like 'wp plugin list' in WordPress CLI or inspect the plugin files in /wp-content/plugins/polylang/ to verify the version. If the version is 3.8.9 or earlier, the system is vulnerable.

Impact Analysis

Attackers could exploit this to perform unauthorized actions on your website, such as stealing sensitive data, defacing the site, or taking control of the server. The CVSS score of 7.2 indicates a significant risk, especially for websites using vulnerable versions of the plugin.

Compliance Impact

This vulnerability could lead to data breaches, which may violate GDPR or HIPAA compliance requirements. Organizations could face legal penalties, fines, or reputational damage if user data is compromised due to this flaw.

Mitigation Strategies

Immediately update the Polylang plugin to version 3.8.10 or later. If updating is not possible, apply the mitigation rule provided by Patchstack to block attacks until an update is applied. Contact your hosting provider or web developer for assistance if needed.

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