---
title: "CVE-2026-93483: Znuny - Authentication Bypass"
description: "Znuny through 7.3.6 contains an authentication bypass caused by trusting the attacker-controlled Remote-User HTTP header in HTTPBasicAuth modules, letting attackers impersonate any user including administrators without a password."
url: https://panop.io/threat-heartbeat/CVE-2026-93483/
---

# CVE-2026-93483 Znuny - Authentication Bypass

Znuny through 7.3.6 contains an authentication bypass caused by trusting the attacker-controlled Remote-User HTTP header in HTTPBasicAuth modules, letting attackers impersonate any user including administrators without a password.

CVSS base score 9.5 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93483)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/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:Y/R:U/V:X/RE:L/U:Red

Published

15 October 2026

Updated

15 October 2026

Weakness

[CWE-348](https://cwe.mitre.org/data/definitions/348.html)

## Vendor fix

Update to a version later than 7.3.6 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-93483](https://nvd.nist.gov/vuln/detail/CVE-2026-93483)
- [https://www.znuny.org/advisories](https://www.znuny.org/advisories)
- [https://www.znuny.org/en/advisories/zsa-2026-14](https://www.znuny.org/en/advisories/zsa-2026-14)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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