CVE-2026-21655 victor vulnerability
Deserialization of untrusted data vulnerability in Johnson Control victor on Windows allows capec-586. This issue affects victor: from 2.9 before 3.0.
Browse Windows security risksQuick answer
Johnson Control victor should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- < 3.0
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-21655 affects victor and involves unsafe deserialization. Untrusted serialized input may bypass expected type or class checks and affect application integrity. Prioritize internet-facing, privileged, automation, and production deployments. Upgrade victor to 3.0 or a later vendor-supported fixed release.
- Inventory every deployment, device, package, plugin, container, build, and environment that uses victor.
- Compare the installed version with the recorded affected range: < 3.0.
- Upgrade victor to 3.0 or a later vendor-supported fixed release.
- Until patched, reduce public exposure, disable the affected workflow where practical, and allow access only from trusted users and systems.
- Review configuration, roles, tokens, network paths, and exposed endpoints connected to victor; remove access that is not required.
- Review application, system, proxy, and audit logs for requests and behavior linked to the affected feature and CVE.
- If exploitation is suspected, isolate affected assets, preserve evidence, rotate exposed credentials or keys, restore trusted data, and rebuild compromised systems before returning them to service.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm every affected asset now runs the fixed vendor-supported release or has the documented mitigation for CVE-2026-21655 in place.
- Use a safe regression test to confirm the affected unsafe deserialization path no longer produces the vulnerable behavior.
- Confirm temporary access controls, endpoint restrictions, network blocks, and least-privilege settings remain effective after the update.
- Review post-remediation logs and rerun Fixnx plus the relevant package, dependency, firmware, browser, or product-specific security check.
- Document affected assets, versions, changes, validation evidence, reviewed logs, and any credential rotation, cleanup, or replacement completed.
Related categories
Related security risks
More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2026-21655?
Johnson Control victor versions listed as affected should be reviewed: < 3.0.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.