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CVE-2026-110021— Missing GSDX SignatureValue verification

Quick assessment

Affected
Phoenix Contact PLCnext Engineer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PLCnext Engineer 会检查 GSDX 清单（manifest）中的引用摘要，但并未对经过规范化的 元素上的 XML 进行密码学验证。未经身份验证的本地攻击者可以修改已签名的 GSDML 内容，更新其清单摘要，保留公钥证书数据，并留下一个无效但非空的 。在 2026.6 版本之前的 PLCnext Engineer 会将该包报告为“有效（Valid）”，并在默认策略下选择修改后的设备描述文件进行导入。

CVSS 6.2 · Medium EPSS 0.06% · P0

Affected Version Matrix 1

VendorProduct Version RangeStatus
Phoenix Contact PLCnext Engineer 0.0< 2026.6 affected
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I. Basic Information for CVE-2026-110021

Vulnerability Information
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Vulnerability Title
Missing GSDX SignatureValue verification
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Phoenix Contact PLCnext Engineer 0.0 ~ 2026.6 -

II. Public POCs for CVE-2026-110021

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-110021

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Other References for CVE-2026-110021 (1)

Same Patch Batch · Phoenix Contact · 2026-11-04 · 3 CVEs total

CVE-2026-110022 8.4 HIGH Signed plug-in validation bypass
CVE-2026-110935 8.4 HIGH Path traversal in plug-in deployment

IV. Related Vulnerabilities

Same product: PLCnext Engineer
Same vendor: Phoenix Contact
Same weakness: CWE-347