CVE-2026-50592Network attack vector

Authenticated script execution via unescaped URL parameters

Published Jun 5, 2026 · Updated Jun 5, 2026

Reflected XSS in AdminCommunicationLog in Znuny LTS before 6.5.21 and Znuny before 7.3.3 allows remote authenticated users to execute JavaScript. The administration view copies URL parameters into page output without proper escaping, causing attacker-supplied script to run in the Znuny origin. A logged-in administrator must open the crafted URL, after which the script runs with that browser session's access to Znuny data and actions.

CVSS severity6.4
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in AdminCommunicationLog in Znuny LTS before 6.5.21 and Znuny before 7.3.3 allows remote authenticated users to execute JavaScript. The administration view copies URL parameters into page output without proper escaping, causing attacker-supplied script to run in the Znuny origin. A logged-in administrator must open the crafted URL, after which the script runs with that browser session's access to Znuny data and actions.

The record

CVE
CVE-2026-50592
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
Znuny GmbH
Product
Znuny
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.5.21
  2. Affected versionversion=7.0.0 <7.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Znuny GmbH · Znunyversion=0 <6.5.21; version=7.0.0 <7.3.3

Published CVSS scores

6.4MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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