CVE-2025-23703 HIGH

CVE-2025-23703: WordPress Free MailClient FMC plugin <= 1.0 - CSRF to Stored XSS vulnerability

Vendor Cstoltenkamp

Product Free MailClient FMC

Weakness CWE-352 · CSRF

Published January 16, 2025

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

7.1/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Cross-Site Request Forgery (CSRF) vulnerability in cstoltenkamp Free MailClient FMC mailclient allows Stored XSS.This issue affects Free MailClient FMC: from n/a through <= 1.0.

Explanation of Vulnerability in Simple Terms

02Summary

Free MailClient FMC versions 1.0 and earlier are vulnerable to cross-site request forgery (CSRF) attacks. An attacker can craft a malicious webpage that, when visited by a logged-in user, performs unwanted actions within the mail client without the user's knowledge. The vulnerability affects confidentiality, integrity, and availability of the application.

What an attacker can do

03Attacker Capabilities

Perform unwanted actions in the mail client on behalf of a logged-in user without their consent.

Potential impact on your site

04Site Impact

Users' mail accounts and data can be compromised through forged requests if they visit malicious sites while logged in.

Conditions required to exploit

05Prerequisites

User must be logged into Free MailClient FMC and visit an attacker-controlled webpage.

Key dates

06Disclosure timeline

January 16, 2025 CVE published

April 28, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2025-23703 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/352.html AskarLabs — CWE-352 write-up Cross-Site Request Forgery

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