CVE-2026-78556

Server spoofing via improper TLS certificate validation

Published Oct 13, 2026 · Updated Oct 13, 2026

TLS validation failure in Siemens Industrial Edge App Publisher before 1.27.9 allows attackers to spoof servers via intercepted traffic. Its outbound TLS connection handling improperly validates the server certificate, allowing interception and relay under a trusted server's identity. Exploitation requires interference in the client-to-server communication path; the supplied record establishes impersonation, not code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TLS validation failure in Siemens Industrial Edge App Publisher before 1.27.9 allows attackers to spoof servers via intercepted traffic. Its outbound TLS connection handling improperly validates the server certificate, allowing interception and relay under a trusted server's identity. Exploitation requires interference in the client-to-server communication path; the supplied record establishes impersonation, not code execution.

The record

CVE
CVE-2026-78556
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Siemens
Product
Industrial Edge App Publisher
Classifications
T1557
Attack vector
Unavailable
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V1.27.9

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesunauthenticated

What is affected?

Siemens · Industrial Edge App Publisherversion=0 <V1.27.9

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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