---
id: CVE-2026-77506
title: Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.
summary: Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-08-20'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77506'
references:
  - url: 'https://www.znuny.org/en/advisories/zsa-2026-12'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00242
epssPercentile: 0.1371
ingestedAt: '2026-09-09T16:14:05.514Z'
---

## Overview

Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.