CVE-2026-39693 WordPress FSM Custom Featured Image Caption plugin <= 1.25.1 - Cross Site Scripting (XSS) vulnerability
An attacker can inject malicious scripts via DOM-based XSS in the FSM Custom Featured Image Caption plugin, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-39693?
CVE-2026-39693 is a medium-severity cross-site scripting vulnerability in fesomia FSM Custom Featured Image Caption, published on 8 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in fesomia FSM Custom Featured Image Caption fsm-custom-featured-image-caption allows DOM-Based XSS.This issue affects FSM Custom Featured Image Caption: from n/a through <= 1.25.1.
Weakness: CWE-79
Which versions are affected by CVE-2026-39693?
How do I fix CVE-2026-39693?
No fix has been published for CVE-2026-39693 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-39693 being exploited?
There is no known exploitation of CVE-2026-39693 in the wild and no public exploit code.
Sources
Also known as GHSA-48m9-5wrg-38p7.