Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.

published 2026-08-20 2 mo ago modified 2026-10-26 14 d ago also EUVD-2026-63586

cvss: 4.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

Patch / fix

fixed in 1 distros 1

Znuny Znuny 6.5.22

znuny Debian 14 6.5.22-1

debian advisories DEBIAN-CVE-2026-77506

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 mo ago (2026-08-25)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.8	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected products

Znuny Znuny

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

znuny.org /en/advisories/zsa-2026-12

Sources

CVE List CVE-2026-77506
NVD CVE-2026-77506

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary