CVE-2025-64353
Published: 31 October 2025
Summary
CVE-2025-64353 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 29.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 CM-11 (User-installed Software) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2025-64353 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the Polylang WordPress plugin by Chouby. The flaw enables Object Injection and affects Polylang versions from n/a through 3.7.3. It carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), reflecting high severity due to its potential for significant impacts across confidentiality, integrity, and availability.
An attacker with network access and low privileges, such as an authenticated WordPress user, can exploit this vulnerability with low complexity and no user interaction required. Successful exploitation allows arbitrary object injection via untrusted deserialization, potentially leading to high-level compromise of the affected system.
Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/polylang/vulnerability/wordpress-polylang-plugin-3-7-3-deserialization-of-untrusted-data-vulnerability?_s_id=cve, which covers the deserialization issue in Polylang 3.7.3.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-37339
Vulnerability details
Deserialization of Untrusted Data vulnerability in Chouby Polylang polylang allows Object Injection.This issue affects Polylang: from n/a through <= 3.7.3.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Deserialization of Untrusted Data (CWE-502) in the Polylang WordPress plugin enables low-privileged remote exploitation leading to potential RCE, directly facilitating T1190: Exploit Public-Facing Application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates CVE-2025-64353 by requiring timely flaw remediation through patching vulnerable Polylang versions <=3.7.3.
Prevents exploitation of the deserialization of untrusted data vulnerability by validating inputs to block malicious object injection payloads in Polylang.
Mitigates risk by authorizing and scanning user-installed software like the vulnerable Polylang WordPress plugin before deployment.