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CVE-2026-4293: Kieback & Peter DDC Building Controllers Cross-site Scripting

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-20 · updated 2026-07-23
• Weakness: CWE-79

Description

The affected Kieback & Peter DDC building controllers are vulnerable to cross-site scripting, enabling JavaScript to be executed by the victim's browser, which allows the attacker to control the browser.

Affected products

• Kieback & Peter DDC4002: through 1.12.14
• Kieback & Peter DDC4002e: through 1.23.4
• Kieback & Peter DDC4020e: through 1.23.4
• Kieback & Peter DDC4040e: through 1.23.4
• Kieback & Peter DDC4100: through 1.12.14
• Kieback & Peter DDC4200: through 1.12.14
• Kieback & Peter DDC4200-L: through 1.12.14
• Kieback & Peter DDC4200e: through 1.23.4
• Kieback & Peter DDC4400: through 1.12.14
• Kieback & Peter DDC4400e: through 1.23.4
• Kieback & Peter DDC520: through 1.24.1

References

• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-139-05.json
• https://www.cisa.gov/news-events/ics-advisories/icsa-26-139-05

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