Znuny up to 6.5.20/7.3.2 User Preferences cross site scripting

Summaryinfo

A vulnerability was found in Znuny up to 6.5.20/7.3.2. It has been classified as problematic. Affected by this vulnerability is an unknown functionality of the component User Preferences Handler. This manipulation causes cross site scripting. This vulnerability appears as CVE-2026-50591. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Znuny up to 6.5.20/7.3.2. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component User Preferences Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

It is possible to read the advisory at znuny.org. This vulnerability is known as CVE-2026-50591 since 06/05/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 318746 (Linux Distros Unpatched Vulnerability : CVE-2026-50591), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.5.21 or 7.3.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (318746) and EUVD (EUVD-2026-34782). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Znuny

Version

• 6.5.0
• 6.5.1
• 6.5.2
• 6.5.3
• 6.5.4
• 6.5.5
• 6.5.6
• 6.5.7
• 6.5.8
• 6.5.9
• 6.5.10
• 6.5.11
• 6.5.12
• 6.5.13
• 6.5.14
• 6.5.15
• 6.5.16
• 6.5.17
• 6.5.18
• 6.5.19
• 6.5.20
• 7.3.0
• 7.3.1
• 7.3.2

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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