Cross-Site Scripting (XSS) in Znuny before LTS (CVE-2026-77506)
Summary
Cross-site scripting in Znuny before LTS (CVE-2026-77506). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A weakness called CVE-2026-77506 was discovered in Znuny before LTS.
In plain terms, it is a flaw that lets attackers sneak nasty scripts into a webpage.
Severity is Medium (CVSS 4.8/10). Exploitation requires specific conditions but can cause real harm if successful.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "Znuny before LTS CVE-2026-77506".
CVE-2026-77506 (Znuny before LTS). Severity: Medium / CVSSv3 4.8. Category: CWE-79.
Response plan:
- Check the vendor advisory for affected versions and the patched release.
- If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
- If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
- Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
A weakness (CVE-2026-77506) in Znuny before LTS. In plain words, it is a flaw that lets attackers sneak nasty scripts into a webpage.
Target versions of Znuny before LTS (see vendor advisory). If running in production, identify exposure immediately.
Severity: Medium (CVSS 4.8/10). Exploitation requires specific conditions but can cause real harm if successful.
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-79)
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-77506 znuny
- Ubuntu UBUNTU-CVE-2026-77506 otrs2
References
- web nvd.nist.gov
- web cve@mitre.org
- web github.com