Vulnerability · Published Jun 5, 2026 · Assigned by mitre
CVE-2026-50591
Medium 5.4
In plain English
A medium-severity cross-site scripting in Znuny from Znuny. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.1%top 97.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | znuny | no fix listed | DEBIAN-CVE-2026-50591 |
| Debian:13 | znuny | no fix listed | DEBIAN-CVE-2026-50591 |
| Debian:14 | znuny | 6.5.21-1 | DEBIAN-CVE-2026-50591 |
| Ubuntu:22.04:LTS | otrs2 | no fix listed | UBUNTU-CVE-2026-50591 |
| Ubuntu:24.04:LTS | znuny | no fix listed | UBUNTU-CVE-2026-50591 |
| Ubuntu:25.10 | znuny | no fix listed | UBUNTU-CVE-2026-50591 |
| Ubuntu:26.04:LTS | znuny | no fix listed | UBUNTU-CVE-2026-50591 |
| Ubuntu:26.10 | znuny | no fix listed | UBUNTU-CVE-2026-50591 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N