The PFI plugin framework deploys executable assemblies (DLLs) from a signed plugin package into the local plugin
Source GCVE Database
Not known to be exploited · CVSS 8.6 High : upgrade to 2026.6 soon.
Data as of 4 Nov 2026, 15:29 UTC
Thin evidence
One scorer or none| CNA (CERTVDE) | CVSS 4.0 | 8.6 |
|---|---|---|
| CNA (CERTVDE) | CVSS 3.1 | 8.4 |
- Patch
- Available – fixed in 2026.6
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 4 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.
What to do
Upgrade PLCnext Engineer to 2026.6.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Phoenix ContactPLCnext Engineer | Affected
| Fixed in
|
AI-suggested
If you cannot patch yet, restrict local access to trusted users to prevent unauthorized modification of plugin packages.
Description
The PFI plugin framework has a vulnerability where it deploys DLLs from a signed plugin package but fails to verify the signature of all archive entries. An unauthenticated local attacker can replace an unsigned DLL outside the signed prefix in the archive, which passes signature verification and overwrites a legitimate signed assembly. This leads to the plugin loader instantiating attacker-supplied code without further integrity checks, resulting in full system compromise.