CVE-2025-26842: An issue was discovered in Znuny through 7.1.3

Q: How do I fix CVE-2025-26842?

znuny: upgrade to newer than 7.1.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-26842 being exploited?

CVE-2025-26842 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-26842 affect?

CVE-2025-26842 affects znuny. Severity is high (CVSS 7.5). An issue was discovered in Znuny through 7.1.3. If access to a ticket is not given, the content of S/MIME encrypted e-mail messages is visible to users with access to the CommunicationLog.

Q: How urgent is CVE-2025-26842?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2025-26842 is a high-severity flaw (CVSS 7.5) affecting znuny. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Znuny through 7.1.3. If access to a ticket is not given, the content of S/MIME encrypted e-mail messages is visible to users with access to the CommunicationLog.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-863
Published	2025-05-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: znuny

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-08 16:15 UTCPublished CVE record published
2026-06-17 09:02 UTCUpdated Record last modified

znuny znuny UPGRADE

Affected: <= 7.1.3

Fixed in: newer than 7.1.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy znuny || rpm -q znuny || znuny --version

2. UPGRADE to newer than 7.1.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade znuny

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade znuny

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-26842?

znuny: upgrade to newer than 7.1.3. Exact commands for each OS are on this page.

Is CVE-2025-26842 being exploited?

CVE-2025-26842 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-26842 affect?

CVE-2025-26842 affects znuny. Severity is high (CVSS 7.5). An issue was discovered in Znuny through 7.1.3. If access to a ticket is not given, the content of S/MIME encrypted e-mail messages is visible to users with access to the CommunicationLog.

How urgent is CVE-2025-26842?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-43926 MEDIUM 6.1 UPGRADE An issue was discovered in Znuny through 6.5.14 and 7.x through 7.1.6
CVE-2025-26847 HIGH 7.5 UPGRADE An issue was discovered in Znuny before 7.1.5
CVE-2025-26846 CRITICAL 9.8 UPGRADE An issue was discovered in Znuny before 7.1.4
CVE-2025-26845 CRITICAL 9.8 UPGRADE An Eval Injection issue was discovered in Znuny through 7.1.3
CVE-2025-26844 CRITICAL 9.8 UPGRADE An issue was discovered in Znuny through 7.1.3

References

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