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CVE-2026-110022

Signed plug-in validation bypass

Products / packages Phoenix Contact PLCnext Engineer

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:55:31 UTC
CERTVDE · CVSS:4.0 · 8.6
Assessment vectorCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CERTVDE · CVSS:3.1 · 8.4
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

high8.6

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

Phoenix Contact PLCnext Engineer versions before 2026.6 are affected by a signed plug-in validation bypass, allowing an unauthenticated local attacker to replace a legitimate assembly with unsigned code. The weakness is due to the deployment routine not covering all archive entries with signature verification. This results in a full compromise of the affected systems.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Phoenix Contact · CERTVDE

PLCnext Engineer

1 range
CERTVDE version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0.0 → before 2026.6

semver versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher 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.

References

1 sources
www.certvde.com/en/advisories/VDE-2026-121/
Security advisoryCERTVDE

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-110022

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-494 ↗

CWE-494 Download of Code Without Integrity Check

CERTVDE

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

CERTVDE · platform conditions

Any condition may hold

Any condition may hold

Vulnerable product

cpe:2.3:a:phoenix_contact:plcnext_engineer:*:*:*:*:*:*:*:*

From (inclusive): 0.0

Before: 2026.6

Applicability preview
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  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:phoenix_contact:plcnext_engineer:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "2026.6",
            "versionStartIncluding": "0.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
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Contributing organizations · 2
CERTVDE

Assigning organization

2026-11-04
CISA-ADP

Additional data publisher

2026-11-04

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-110022

    Observed 2026-11-04T20:49:47.565Z · upstream updated 2026-11-04T20:10:32.499Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-04T20:10:17.506128Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.