# CVE-2026-78557: Siemens Industrial Edge App Publisher improper certificate validation

Source: https://junglewise.ai/threats/cve-2026-78556-a-vulnerability-has-been-identified-in-industrial-edge-app  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-78557 · Severity: high · CVSS 7.4 · Published 2026-10-13

Industrial Edge App Publisher is a tool that packages applications for deployment on Siemens Industrial Edge devices. The software fails to properly validate TLS certificates, allowing an attacker on the network to impersonate a trusted management server. Combined with a separate code injection vulnerability, this enables remote code execution on affected machines.

Vendors: [Siemens](https://junglewise.ai/threats/vendors/siemens).

## Quick answers

**Is CVE-2026-78557 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78557 being exploited in the wild.

**How severe is CVE-2026-78557?** High severity, with a CVSS score of 7.4, published 13 October 2026.

**Which products and versions are affected?** Siemens Industrial Edge App Publisher All versions < V1.27.9.

**Is there a fix for CVE-2026-78557?** Yes: fixed in V1.27.9 or later. Until then: Protect network access to devices with appropriate mechanisms and configure the environment according to Siemens' operational guidelines for Industrial Security to restrict exposure to potential man-in-the-middle attackers on the network. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-78557 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-78557?** Check whether you run Siemens Industrial Edge App Publisher at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in V1.27.9 or later

Protect network access to devices with appropriate mechanisms and configure the environment according to Siemens' operational guidelines for Industrial Security to restrict exposure to potential man-in-the-middle attackers on the network.

## Technical details

The vulnerability is an improper certificate validation flaw (CWE-295) in TLS connection handling that does not verify the server certificate, enabling man-in-the-middle attacks. An attacker on the network can intercept and spoof communication without authentication or user interaction required. When chained with CVE-2026-78557 (XSS via unsanitized backend data), this allows arbitrary code execution through Node.js integration.

## Affected products

- Siemens Industrial Edge App Publisher All versions < V1.27.9

## Identifiers

- CVE-2026-78557
- CVE-2026-78556

## Timeline

- 2026-10-13: disclosed
- 2026-10-13: advisory: SSA-968435

## References

- [https://cert-portal.siemens.com/productcert/html/ssa-968435.html](https://cert-portal.siemens.com/productcert/html/ssa-968435.html)

## Related threats

- [Siemens Industrial Edge App Publisher XSS and RCE via unescaped backend data](https://junglewise.ai/threats/cve-2026-78557-a-vulnerability-has-been-identified-in-industrial-edge-app)