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TI-2026-84998 Aliases CVE-2026-110021GHSA-rr6j-2cpg-6832

Phoenix Contact PLCnext Engineer: missing GSDX SignatureValue verification

Priority LOW 29CWE-347Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-347.

Summary

PLCnext Engineer checks the manifest reference digests in GSDX packages but does not cryptographically verify the XML SignatureValue over the canonicalized SignedInfo. An unauthenticated local attacker can modify signed GSDML content, update the manifest digest, keep the public certificate data, and leave an invalid nonempty SignatureValue. Prior to 2026.6, PLCnext Engineer reports the package as Valid and selects the modified device description for import under the default policy.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

PLCnext Engineer checks GSDX manifest reference digests but does not cryptographically verify the XML `SignatureValue` over canonicalized `SignedInfo`. An unauthenticated local attacker can modify signed GSDML content, update its manifest digest, retain the public certificate data, and leave an invalid nonempty `SignatureValue`. PLCnext Engineer prior to 2026.6 reports the package as `Valid` and selects the modified device description for import under the default policy.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00062 0th percentileScored 2026-11-07
Fix Fixed PLCnext Engineer (Phoenix Contact): 2026.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Phoenix ContactPLCnext Engineer0.0 to before 2026.62026.6Patch availableCNA
  • PLCnext Engineer VendorPhoenix Contact Affected 0.0 to before 2026.6 Fixed in 2026.6 Patch available CNA

Remediation

Update PLCnext Engineer to version 2026.6 or later, which is the fixed release for this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA PLCnext Engineer (Phoenix Contact) Fixed in 2026.6

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Phoenix Contact PLCnext Engineer 2026.6

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-85000 Path traversal in Phoenix Contact PLCnext Engineer plug-in deploymentPriority LOW 38
    • TI-2026-84999 Signature check bypass in Phoenix Contact PLCnext EngineerPriority LOW 38
    Show all 3 records →

Timeline

  1. 2026-11-04 Threatist record created from CVE-2026-110021
  2. 2026-11-04 Alias added: GHSA-rr6j-2cpg-6832
  3. 2026-11-04 CISA SSVC decision points changed
  4. 2026-11-04 Priority changed: MEDIUM → LOW

References

Other 1

  • TI-2014-07463 Phoenix Contact Software ProConOs and MultiProg Missing Authentication for Critical Function CVSS 2.0CRITICAL 10.0
  • TI-2024-17093 PHOENIX CONTACT: Remote code execution in CHARX Series CVSS 3.1CRITICAL 9.8
  • TI-2022-13692 Insufficient Verification of Data Vulnerability in PHOENIX CONTACT classic line industrial controllers CVSS 3.1CRITICAL 9.8
  • TI-2026-21959 Remote code execution via uploading a malicious IODD file CVSS 3.1CRITICAL 9.8
  • TI-2026-21940 Authentication Bypass in _account_log CVSS 3.1CRITICAL 9.8
  • TI-2023-03334 PHOENIX CONTACT: OS Command Injection in WP 6xxx Web panels CVSS 3.1CRITICAL 10.0
See all 194 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences