CVE-2026-50591

IN Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

5.4 MediumFix available

In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.13%Up 0.1 points since Jun 5, 2026

What each source reports

CVE List Score used 5.4

In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

Record: CVE-2026-50591
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2026-34782 5.4

In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

Record: EUVD-2026-34782
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-qfgf-x7qr-jq6q 5.4

IN Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

IN Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

Record: GHSA-qfgf-x7qr-jq6q
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 5.4

In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

Record: CVE-2026-50591
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-50591 5.4

In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

Record: DEBIAN-CVE-2026-50591
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-50591 5.4

In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

Record: UBUNTU-CVE-2026-50591
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

Affected products

znuny

Affected packages

Affected packages
Package	Affected	Fixed
`znuny` Debian:12	All versions, plus listed versions 6.3.2-36.3.3-16.3.3-1~bpo11+16.3.4-16.3.4-1~bpo11+1 Show 45 moreShow less 6.4.2-16.4.2-1~bpo11+16.4.2-26.4.3-16.4.3-1~bpo11+16.4.4-16.4.5-16.4.5-1~bpo11+16.4.5-26.5.1-16.5.10-16.5.10-1~bpo12+16.5.11-16.5.11-1~bpo12+16.5.13-16.5.14-16.5.14-1~bpo12+16.5.15-16.5.15-26.5.15-2~bpo12+16.5.16-16.5.18-16.5.18-1~bpo13+16.5.19-16.5.20-16.5.21-16.5.22-16.5.22-1~bpo13+16.5.23-16.5.23-1~bpo13+16.5.24-16.5.24-1~bpo13+16.5.25-16.5.25-1~bpo13+16.5.3-16.5.3-1~bpo12+16.5.4-16.5.4-1~bpo12+16.5.5-16.5.5-1~bpo12+16.5.6-16.5.6-1~bpo12+16.5.8-16.5.8-1~bpo12+16.5.9-1	None known
`znuny` Debian:13	All versions, plus listed versions 6.3.2-36.3.3-16.3.3-1~bpo11+16.3.4-16.3.4-1~bpo11+1 Show 45 moreShow less 6.4.2-16.4.2-1~bpo11+16.4.2-26.4.3-16.4.3-1~bpo11+16.4.4-16.4.5-16.4.5-1~bpo11+16.4.5-26.5.1-16.5.10-16.5.10-1~bpo12+16.5.11-16.5.11-1~bpo12+16.5.13-16.5.14-16.5.14-1~bpo12+16.5.15-16.5.15-26.5.15-2~bpo12+16.5.16-16.5.18-16.5.18-1~bpo13+16.5.19-16.5.20-16.5.21-16.5.22-16.5.22-1~bpo13+16.5.23-16.5.23-1~bpo13+16.5.24-16.5.24-1~bpo13+16.5.25-16.5.25-1~bpo13+16.5.3-16.5.3-1~bpo12+16.5.4-16.5.4-1~bpo12+16.5.5-16.5.5-1~bpo12+16.5.6-16.5.6-1~bpo12+16.5.8-16.5.8-1~bpo12+16.5.9-1	None known
`znuny` Debian:14	before 6.5.21-1, plus listed versions 6.3.2-36.3.3-16.3.3-1~bpo11+16.3.4-16.3.4-1~bpo11+1 Show 37 moreShow less 6.4.2-16.4.2-1~bpo11+16.4.2-26.4.3-16.4.3-1~bpo11+16.4.4-16.4.5-16.4.5-1~bpo11+16.4.5-26.5.1-16.5.10-16.5.10-1~bpo12+16.5.11-16.5.11-1~bpo12+16.5.13-16.5.14-16.5.14-1~bpo12+16.5.15-16.5.15-26.5.15-2~bpo12+16.5.16-16.5.18-16.5.18-1~bpo13+16.5.19-16.5.20-16.5.3-16.5.3-1~bpo12+16.5.4-16.5.4-1~bpo12+16.5.5-16.5.5-1~bpo12+16.5.6-16.5.6-1~bpo12+16.5.8-16.5.8-1~bpo12+16.5.9-16.5.9-1~bpo12+1	6.5.21-1
`otrs2` Ubuntu:16.04:LTS	All versions, plus listed versions 4.0.10-15.0.1-15.0.1-25.0.2-15.0.3-15.0.5-15.0.6-15.0.7-1	None known
`otrs2` Ubuntu:18.04:LTS	All versions, plus listed versions 5.0.23-15.0.24-16.0.1-16.0.2-16.0.3-16.0.4-16.0.5-1	None known
`otrs2` Ubuntu:20.04:LTS	All versions, plus listed versions 6.0.20-16.0.23-26.0.24-16.0.25-16.0.25-26.0.25-36.0.26-1	None known
`otrs2` Ubuntu:22.04:LTS	All versions, plus listed versions 6.0.32-66.1.2-16.2.1-16.2.2-2	None known
`znuny` Ubuntu:24.04:LTS	All versions, plus listed versions 6.5.3-16.5.4-16.5.5-16.5.6-1	None known
`znuny` Ubuntu:25.10	All versions, plus listed versions 6.5.14-16.5.15-2	None known
`znuny` Ubuntu:26.10	All versions, plus listed versions 6.5.18-16.5.20-16.5.21-16.5.22-16.5.23-1	None known
`znuny` Ubuntu:26.04:LTS	All versions, plus listed versions 6.5.15-26.5.18-1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-50591 is a medium vulnerability (CVSS 5.4) in Znuny, published June 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.13%, the 2nd percentile. Fixed in znuny 6.5.21-1.

References

This page doesn't list everything

Left out here: 2 versions. The JSON record has them.