XSS in Znuny

CVE-2026-77506

Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

Affected products

Znuny

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-77506?: CVE-2026-77506 is a medium-severity vulnerability in Znuny, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-08-20.
How severe is CVE-2026-77506?: Medium severity. CVSS v3 base score is 4.8 out of 10.