CVE-2026-66146 Cross-site scripting in GMS
Remote attackers can execute arbitrary JavaScript in user browsers via XSS vulnerabilities in SonicWall GMS, potentially compromising user sessions.
- 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-2026-66146?
CVE-2026-66146 is a medium-severity cross-site scripting vulnerability in SonicWall GMS, published on 11 Aug 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
Multiple Cross-Site Scripting (XSS) vulnerabilities were identified in GMS 9.5.1 (Build 9510.1044) and earlier versions that allow a remote attacker to execute javascript script in a user's browser.
Weakness: CWE-79
Which versions are affected by CVE-2026-66146?
How do I fix CVE-2026-66146?
No fix has been published for CVE-2026-66146 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-2026-66146 being exploited?
There is no known exploitation of CVE-2026-66146 in the wild and no public exploit code.
Sources
Also known as GHSA-4hvc-qq88-xc6c.