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 8.3, published 13 October 2026.
- Which products and versions are affected?
- Siemens Industrial Edge App Publisher All versions before V1.27.9.
- Is there a fix for CVE-2026-78557?
- Yes: fixed in V1.27.9 or later. Until then: Siemens recommends protecting network access to devices with appropriate security mechanisms and operating the devices in a protected IT environment following Siemens' operational guidelines for Industrial Security. 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 web application.
- 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
Siemens recommends protecting network access to devices with appropriate security mechanisms and operating the devices in a protected IT environment following Siemens' operational guidelines for Industrial Security.
Technical details
The vulnerability is a cross-site scripting (XSS) issue in the frontend where unsanitized data from backend responses is rendered directly into the UI. The frontend's integration with Node.js allows injected JavaScript to execute with elevated privileges, leading to RCE. The attack requires network access and user interaction; it is commonly chained with CVE-2026-78556 (improper certificate validation) to enable server impersonation.
Affected products
- Siemens Industrial Edge App Publisher All versions before V1.27.9
Timeline
- 2026-10-13: advisory