CVE-2026-77506
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.
Risk Assessment
An attacker could inject malicious scripts, leading to session theft, account takeover, or malware distribution.
Recommendation
Upgrade Znuny to LTS 6.5.22 or later to fix this vulnerability.
Other vulnerabilities in Znuny
See all- CVE-2026-93483Critical
In Znuny through 7.3.6, an attacker can bypass specific standard login procedures and gain unauthorized access to sensitive system functions by manipulating a specific HTTP request header. Because the application incorrectly trusts this header, an attacker can impersonate any user, including administrators, without requiring a password. The HTTPBasicAuth modules for the agent and customer interfaces read the username not only from $ENV{REMOTE_USER} but also, as a fallback, from $ENV{HTTP_REMOTE_USER}, which is populated directly from an attacker-controllable "Remote-User" request header.
- CVE-2026-93484High
Znuny through 7.3.6 constructs a ticket-search database query by directly concatenating user-supplied input into the SQL statement. Lack of validation of the ContentSearch parameter (expected to be "AND" or "OR") in Kernel::System::Ticket::TicketSearch and Kernel::System::Ticket::ArticleSearchIndex::DB allows injection of arbitrary SQL commands.
- CVE-2026-50592Medium
In Znuny LTS before 6.5.21 and Znuny before 7.3.3, there is reflected XSS in AdminCommunicationLog (communication log administration view).
- CVE-2026-50591Medium
Cross-Site Scripting (XSS) vulnerability in Znuny LTS before 6.5.21 and Znuny before 7.3.3 via stored user preferences.
Original NVD description (English source)
Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS