Vulnerability · Published Nov 4, 2026 · Assigned by CERTVDE
CVE-2026-110022Signed plug-in validation bypass
High 8.4
In plain English
A high-severity security flaw in PLCnext Engineer from Phoenix Contact. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
Official description
The PFI plugin framework deploys executable assemblies (DLLs) from a signed plugin package into the local plugin repository and loads them via reflection, but the deployment routine processes archive entries that were never covered by the signature verification. An unauthenticated local attacker can replace an unsigned DLL outside the signed prefix in the archive passes verification and overwrites the legitimate signed assembly at the same destination path. The plugin loader then instantiates the attacker-supplied code without any additional integrity check resulting in a full compromise of the affected systems.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Phoenix Contact | PLCnext Engineer | 0.0 – before 2026.6 |
Weakness: CWE-494 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H