CVE-2026-105671

Zenitel Connect login allows username enumeration via verbose error responses

publishedCWE-204

The login flow in Zenitel Connect before 1.11.0 returns different error responses depending on whether a submitted username exists, which allows remote attackers to enumerate valid user accounts via crafted login requests.

Technical severity6.9 mediumCVSS 4.0 · CNA: Zenitel

Published2026-11-13Source updated 2026-11-13

Collected2026-11-132 attributed sources

Fixes and workarounds

Fix

Upgrade to version 1.11.0

Source: CNA: Zenitel

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Zenitel Connect Zenitel	≥ 0; < 1.11.0 (affected, semver) Other versions: unaffected	CNA: Zenitel

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 6.9 medium	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`	CNA: Zenitel
4.0 / 6.9 medium	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X`	NVD: cf9c5165-6fe5-4ec0-b5f1-404f1df30a4e

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://www.zenitel.com/sites/default/files/2026-11/A100K12404-Zenitel-Security-Advisory.pdfCNA: Zenitel
https://www.zenitel.com/sites/default/files/2026-11/A100K12404-Zenitel-Security-Advisory.pdfcf9c5165-6fe5-4ec0-b5f1-404f1df30a4e

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