CVE-2025-31919 CRITICAL

CVE-2025-31919: WordPress Spare <= 1.7 - PHP Object Injection Vulnerability

Vendor Themeton

Product Spare

Weakness CWE-502 · Unsafe deserialization

Published June 17, 2025

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

9.8/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality High

Integrity High

CVSS vector

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

What the vulnerability does

01Description

Deserialization of Untrusted Data vulnerability in themeton Spare allows Object Injection. This issue affects Spare: from n/a through 1.7.

Explanation of Vulnerability in Simple Terms

02Summary

Spare versions up to 1.7 contain a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code on the server. The vulnerability exists because the application deserializes untrusted data without proper validation. An attacker can exploit this remotely without authentication or user interaction to gain full control of the affected system.

What an attacker can do

03Attacker Capabilities

Run their own code on the server and take complete control of the site.

Potential impact on your site

04Site Impact

Complete compromise of the site and server; attacker can read, modify, or delete all data.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

June 17, 2025 CVE published

April 28, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2025-31919 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/502.html AskarLabs — CWE-502 write-up Deserialization of Untrusted Data

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