CVE-2026-77506
An attacker can exploit a vulnerability in Znuny to conduct a Cross-Site Scripting attack.
CSIRTS triage
- What
- A vulnerability in Znuny enables attackers to conduct cross-site scripting attacks.
- Who is affected
- All deployments of Znuny are affected.
- Urgency
- Medium urgency; cross-site scripting can compromise user sessions and data, though not currently known to be exploited.
- Action
- Update Znuny to a patched version addressing CVE-2026-77506.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.
Advisory coverage (2)
- medium[UPDATE] [medium] Znuny: Vulnerability enables Cross-Site Scriptingcert-bund · 2026-08-21
- mediumCVE-2026-77506: Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.nvd · 2026-08-20
External references
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[](https://www.csirts.com/cve/CVE-2026-77506)