CVE-2026-57403 WordPress GD Security Headers plugin <= 1.8 - Cross Site Scripting (XSS) vulnerability
Reflected XSS in GD Security Headers plugin allows attackers to execute arbitrary scripts in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-57403?
CVE-2026-57403 is a high-severity cross-site scripting vulnerability in Milan Petrovic GD Security Headers, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, 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 Milan Petrovic GD Security Headers gd-security-headers allows Reflected XSS.This issue affects GD Security Headers: from n/a through <= 1.8.
Weakness: CWE-79
Which versions are affected by CVE-2026-57403?
How do I fix CVE-2026-57403?
No fix has been published for CVE-2026-57403 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-2026-57403 being exploited?
There is no known exploitation of CVE-2026-57403 in the wild and no public exploit code.
Sources
Also known as GHSA-43x4-rq45-2wx7.