Kieback & Peter DDC building controllers vulnerable to XSS attacks
Cross-site scripting vulnerability (CVE-2026-4293) in Kieback & Peter DDC building controllers allows attackers to execute JavaScript in victim browsers.
Sourcecisa.gov — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CISA has published an advisory for a cross-site scripting (XSS) vulnerability affecting multiple Kieback & Peter DDC building automation controllers used in critical infrastructure sectors globally. The vulnerability, tracked as CVE-2026-4293, allows attackers to execute arbitrary JavaScript in the context of a victim's browser when accessing the controller's web portal, potentially enabling session hijacking or further attacks. Eleven product models are affected across three firmware branches, with versions up to 1.12.14, 1.23.4, and 1.24.1 impacted.
Five legacy models (DDC4002, DDC4100, DDC4200, DDC4200-L, DDC4400) are end-of-maintenance and will not receive patches. For these devices, the vendor recommends strict network segmentation, disabling the web portal if not needed, and restricting access to trusted users only. Six newer models have firmware updates available: DDC4002e through DDC4040e should update to version 1.23.5 or newer, while DDC520 should update to 1.24.2 or newer.
The vendor emphasizes that these controllers are designed for closed building automation networks and should never be directly exposed to the Internet. CISA recommends implementing defense-in-depth strategies, network segmentation with firewalls separating OT zones, and using secure remote access methods like VPNs when necessary. The advisory affects multiple critical infrastructure sectors including commercial facilities, healthcare, government, and financial services across several countries.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-139-05
Free public brief. Slack alerts on the vendors you run come with the paid plans, and a new account gets three days of them, no card.
What this brief leaves out
This page is the free tier: the write-up, the severity, the names. In the app the same report carries live profiles of the CVEs it names. The paid plans add the security research and news reporting the free tier leaves out.
It sits in a corpus of 16,436 reports from 149 sources, 661 of them written in the last seven days, and it grows through the day.
A new account starts with three days of all of it, no card, then keeps the government and CERT reporting free. Slack alerts are a paid-plan feature: name the vendors you run and Slack hears about the reports that touch them, not the rest of the week's. Nothing is charged unless you subscribe.
Create a free account What it costs