CVE-2026-27537 WordPress Popup by Supsystic plugin <= 1.11.2 - Cross Site Scripting (XSS) vulnerability
Unauthenticated attackers can inject malicious scripts via the Popup by Supsystic plugin, potentially compromising user sessions or site integrity.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-27537?
CVE-2026-27537 is a medium-severity cross-site scripting vulnerability in Popup by Supsystic, published on 13 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Unauthenticated Cross Site Scripting (XSS) in Popup by Supsystic <= 1.11.2 versions.
Weakness: CWE-79
Which versions are affected by CVE-2026-27537?
How do I fix CVE-2026-27537?
No fix has been published for CVE-2026-27537 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-2026-27537 being exploited?
There is no known exploitation of CVE-2026-27537 in the wild and no public exploit code.
Sources
Also known as GHSA-qrg3-qvgr-8m6x.