CVE-2026-82773 Cross-site scripting in M2M Controller Configurable type CPS-MCS341*
Cross-site scripting allows arbitrary script execution in a logged-in user's browser on CONPROSYS M2M Gateways and Controllers.
- 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-2026-82773?
CVE-2026-82773 is a medium-severity cross-site scripting vulnerability in Contec Co., Ltd. M2M Controller Configurable type CPS-MCS341*, published on 14 Sep 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
Cross-site scripting vulnerability exists in CONPROSYS M2M Gateway Series and CONPROSYS M2M Controller Series. If this vulnerability is exploited, an arbitrary script may be executed on a logged-in user's web browser.
Weakness: CWE-79
Which versions are affected by CVE-2026-82773?
How do I fix CVE-2026-82773?
No fix has been published for CVE-2026-82773 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-2026-82773 being exploited?
There is no known exploitation of CVE-2026-82773 in the wild and no public exploit code.
Sources
Also known as GHSA-vp8h-949q-v4xc.