CVE-2026-21655 C-CURE 9000 and Victor application server - Deserialization of Untrusted Data
Attackers can execute arbitrary code by exploiting a deserialization vulnerability in Johnson Controls access control systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21655?
CVE-2026-21655 is a high-severity unsafe deserialization vulnerability in Johnson Control CCure 9000, published on 23 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Deserialization of untrusted data vulnerability in Johnson Control victor on Windows, Johnson Controls CCure 9000, and Johnson Controls Victor Application Server allows capec-586.
This issue affects victor: before 8.0; CCure 9000: before 3.2; Victor Application Server: before 4.1.
Weakness: CWE-502
Which versions are affected by CVE-2026-21655?
How do I fix CVE-2026-21655?
No fix has been published for CVE-2026-21655 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-21655 being exploited?
There is no known exploitation of CVE-2026-21655 in the wild and no public exploit code.
Sources
Also known as GHSA-g8rm-mhj7-46cg.