Cross-site Scripting Vulnerability in FSM Custom Featured Image Caption by WordPress
CVE-2026-39693

5.9MEDIUM

Key Information:

Vendor

WordPress
Status
Fsm Custom Featured Image Caption
Vendor
CVE Published:
8 April 2026

What is CVE-2026-39693?

The FSM Custom Featured Image Caption plugin for WordPress contains a vulnerability that allows for Cross-site Scripting (XSS) attacks due to improper sanitization of input during web page generation. This security flaw enables attackers to inject malicious scripts into web pages viewed by users, which can lead to unauthorized actions or data theft. The issue affects all versions of the plugin up to and including 1.25.1, making it critical for website administrators to update to the latest patched version to safeguard their systems against potential exploits.

Affected Version(s)

FSM Custom Featured Image Caption 0 <= 1.25.1

References

https://patchstack.com/database/Wordpress/Plugin/fsm-cust...
vdb-entry

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Nabil Irawan | Patchstack Bug Bounty Program
.