CVE-2025-23703

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): Patchstack
CVSS severity: HIGH
CVSS score: 7.1 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Effective score: 7.1 / 10 HIGH source: CNA overview
CWE(s): CWE-352
Reserved: 2025-01-16
Published: 2025-01-16 21:06 UTC
Last updated: 2026-04-28 18:11 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2025/23xxx/CVE-2025-23703.json
Linked Threat: CVE-2025-23703 — Free MailClient FMC <= 1.0 - Cross-Site Request Forgery to Stored Cross-Site Scripting

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2025-01-16 20:15:45 UTC
NVD last modified: 2026-06-17 08:56:31 UTC
NVD CVSS v3.1: 7.1 / 10 HIGH source: audit@patchstack.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Exploitability subscore: 2.8 / 10
Impact subscore: 3.7 / 10
EPSS score: 0.0017 (probability of exploitation in next 30 days)
EPSS percentile: 6.88% vs all CVEs — higher = more likely to be exploited, as of 2026-07-26

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2025-3359
Assigner: Patchstack
Published: Jan 16, 2025, 8:06:45 PM
Updated: Apr 28, 2026, 4:11:17 PM
EUVD base score (CVSS 3.1): 7.1 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
EUVD-reported EPSS: 0.1300
Vendors: CS : ABS-Hosting.nl / Walchum.net, cstoltenkamp
Products: Free MailClient FMC (0 ≤1.0)

Free MailClient FMC (n/a ≤1.0)
Aliases: GHSA-gh9p-4cw5-w8fw

ENISA description: 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.

EUVD references (1)

https://patchstack.com/database/Wordpress/Plugin/mailclient/vulnerability/wordpress-free-mailclient-fmc-plugin-1-0-csrf-to-stored-xss-vulnerability?_s_id=cve

Affected products (1)

Vendor	Product	Versions	Platforms
cstoltenkamp	Free MailClient FMC	`0` (affected)	—

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://patchstack.com/database/Wordpress/Plugin/mailclient/vulnerability/wordpress-free-mailclient-fmc-plugin-1-0-csrf-to-stored-xss-vulnerability?_s_id=cve vdb-entry

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://patchstack.com/database/Wordpress/Plugin/mailclient/vulnerability/wordpress-free-mailclient-fmc-plugin-1-0-csrf-to-stored-xss-vulnerability?_s_id=cve vdb-entry

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://patchstack.com/database/Wordpress/Plugin/mailclient/vulnerability/wordpress-free-mailclient-fmc-plugin-1-0-csrf-to-stored-xss-vulnerability?_s_id=cve audit@patchstack.com

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
domain	`xss.this`	no local data	2026-05-18 21:19 UTC
cve	`CVE-2025-23703`	no local data	2026-06-06 14:00 UTC

Remediations (13)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Wordfence remediation: Free MailClient FMC

Wordfence

No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.

2026-06-06 14:00 UTC
Patch Tuesday 2025 Year In Review | Tenable®

web:www.tenable.com

Key takeaways: Microsoft's 2025 Patch Tuesday releases addressed 1,130 CVEs . This is the second year in a row where the CVE count was over 1,000. Elevation of Privilege vulnerabilities accounted for 38.3% of all Patch Tuesday vulnerabilities in 2025 , followed by Remote Code Execution flaws at 30.8%. 41 zero-day vulnerabilities were addressed across all Patch Tuesday releases in 2025 , including ...

2026-05-22 12:29 UTC
Microsoft Patch Tuesday security updates for March 2026 fixed 84 bugs

web:securityaffairs.com

Microsoft Patch Tuesday security updates for March 2026 addressed 84 vulnerabilities across its products. The IT giant addressed flaws across Windows, Office, Edge, Azure, SQL Server, Hyper-V, and ReFS. Including third-party and Chromium updates, the total reaches 94 vulnerabilities. Eight flaws are rated Critical and the rest Important.

2026-05-22 12:29 UTC
Microsoft issues emergency patches for SharePoint zero-days exploited ...

web:securityaffairs.com

Microsoft patched an exploited SharePoint flaw ( CVE - 2025 -53770) and disclosed a new one, warning of ongoing attacks on on-prem servers. Microsoft released emergency SharePoint updates for two zero-day flaws, tracked as CVE - 2025 -53770 and CVE - 2025 -53771, exploited since July 18 in attacks dubbed " ToolShell." Both vulnerabilities only impact on-premises SharePoint Servers, threat actors ...

2026-05-22 04:06 UTC
Microsoft March 2025 Patch Tuesday fixes 7 zero-days, 57 flaws

web:www.bleepingcomputer.com

Today is Microsoft's March 2025 Patch Tuesday, which includes security updates for 57 flaws, including six actively exploited zero-day vulnerabilities.

2026-05-22 04:06 UTC
Microsoft Patch Tuesday for March 2026 — Snort rules and prominent ...

web:blog.talosintelligence.com

Microsoft has released its monthly security update for March 2026 which includes 79 vulnerabilities, including three that Microsoft marked as "critical." The remaining vulnerabilities listed are classified as "important." Microsoft assessed that exploitation of the three "critical" vulnerabilities is "less likely." CVE -2026-26110 and CVE -2026-26113 are "critical" Microsoft ...

2026-05-22 04:06 UTC
February's Patch Tuesday release fixes 59 flaws ... - Computerworld

web:www.computerworld.com

Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...

2026-05-22 04:06 UTC
March 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's March 2026 Patch Tuesday addresses 82 CVEs , featuring eight Critical vulnerabilities.

2026-05-22 04:06 UTC
Microsoft Confirms Global SharePoint Attack — Emergency ... - Forbes

web:www.forbes.com

Microsoft has confirmed that SharePoint Server is under mass global attack. Breaking: An emergency patch has now been released — update immediately.

2026-05-22 04:06 UTC
I tested Windows 11 March 2026 Updates: Everything new ... - Windows Latest

web:www.windowslatest.com

Windows 11 March 2026 Patch Tuesday update adds Emoji 16.0, Sysmon, network speed test, reliability improvements, and security fixes.

2026-05-22 04:06 UTC
UPDATE: Microsoft Releases Guidance on Exploitation of ... - CISA

web:www.cisa.gov

. For more information see MAR-251132.c1.v1 Exploitation of SharePoint Vulnerabilities and CISA Releases Malware Analysis Report Associated with Microsoft SharePoint Vulnerabilities. Update (07/31/ 2025 ): CISA has updated this alert to provide clarification on antivirus and endpoint detection and response (EDR) solutions, and details regarding mitigations related to the IIS server. Update (07 ...

2026-05-22 04:06 UTC
Microsoft Patch Tuesday March 2026 - 78 Vulnerabilities Fixed ...

web:cybersecuritynews.com

Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026, addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE -2026-21262, the sole zero-day ...

2026-05-22 04:06 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-22 04:06 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2025-23703.json.

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