Phoenix Contact: GSDX SignatureValue verification, signed plug-in validation bypass and path traversal vulnerabilities
Affects Phoenix ContactSource GCVE Database
Not known to be exploited · CVSS 6.9 Medium : upgrade to 2026.6 when convenient.
Data as of 4 Nov 2026, 10:29 UTC
Thin evidence
One scorer or none| CNA (CERTVDE) | CVSS 4.0 | 6.9 |
|---|---|---|
| CNA (CERTVDE) | CVSS 3.1 | 6.2 |
- Patch
- Available – fixed in 2026.6
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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 access to the affected software and carefully validate plugin packages and device descriptions before deployment.
Description
Multiple vulnerabilities affect Phoenix Contact's software version 2026.6, including a signature verification bypass in GSDX, a plugin deployment signature bypass, and a path traversal vulnerability during plugin deployment. These flaws allow tampered device descriptions to be accepted as valid, arbitrary code execution via unsigned plugin components, and writing files outside intended directories with user permissions.
References
- phoenixcontact.com/psirt (opens in a new tab)
- certvde.com/de/advisories/vendor/phoenixcontact/ (opens in a new tab)
- certvde.com/en/advisories/VDE-2026-121 (opens in a new tab)
- phoenixcontact.csaf-tp.certvde.com/.well-known/csaf/white/2026/vde-2026-121.json (opens in a new tab)
- dam-mdc.phoenixcontact.com/asset/156443151564/0a870ae433c19148b80bd760f3a1c1f2/107913_en_03.pdf (opens in a new tab)