CVE-2026-22109— Default WebUI passwords stored in plaintext

Quick assessment

Affected

Delta Electronics Delta UFC500

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

随设备发布的 WebUI 模板数据库中，所有五种账户类型的出厂默认密码均以明文形式保留。这些默认密码在不同设备间完全相同，且在本次测试的设备上未被修改。

CVSS 8.4 · High Updated Oct 31, 2026

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force

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Vulnerability Information

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Vulnerability Title

Default WebUI passwords stored in plaintext

Source: CVE Program / CVE List V5

Vulnerability Description

The shipped WebUI template database retains the factory default passwords for all five account types in cleartext. Defaults are identical across devices and were unchanged on the tested unit.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:H/SI:H/SA:L

Source: CVE Program / CVE List V5

Vulnerability Type

CWE-1392

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Delta Electronics	Delta UFC500	2.4.18	-
Delta Electronics	Delta UFC500	0 ~ 1.4.7	-

II. Public POCs for CVE-2026-22109

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-22109

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Vendor Advisories for CVE-2026-22109 (2)

🔗 DIVD CSIRT | Making the internet safer through Coordinated Vulnerability Disclosure third-party-advisory
🔗 DIVD-2026-00012 - MikroTik RouterOS MikroTrick vulnerabilities | DIVD CSIRT third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-22109

Same Patch Batch · Delta Electronics · 2026-10-30 · 4 CVEs total

CVE-2026-22110	8.7 HIGH	Missing authentication check on POST/PUT requests
CVE-2026-22105	8.7 HIGH	Use of default password based on serial number
CVE-2026-22114	5.3 MEDIUM	Missing brute-force protection for web interface

IV. Related Vulnerabilities

Same product: Delta UFC500

Same vendor: Delta Electronics

Same weakness: CWE-1392