CVE-2022-39195: A cross-site scripting (XSS) vulnerability in the LISTSERV 17 web interface allows remote attackers to inject

This month

MEDIUM 6.1DOWNGRADE

CVE-2022-39195 is a medium-severity flaw (CVSS 6.1) affecting listserv. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-site scripting (XSS) vulnerability in the LISTSERV 17 web interface allows remote attackers to inject arbitrary JavaScript or HTML via the c parameter.

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	6.5% (top 6%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-01-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lsoft

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

Am I affected?

Timeline

2023-01-17 21:15 UTCPublished CVE record published
2026-06-17 04:57 UTCUpdated Record last modified

lsoft listserv DOWNGRADE

Affected: 17.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 17.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 17.0 (Debian / Ubuntu)

apt-cache madison listserv sudo apt install listserv=<VERSION_BEFORE_17.0> sudo apt-mark hold listserv

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list listserv sudo dnf downgrade listserv-<VERSION_BEFORE_17.0> sudo dnf versionlock add listserv

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: LISTSERV 17 - Reflected Cross Site Scripting (XSS)
Nuclei scan template: LISTSERV 17 - Cross-Site Scripting

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-2022-39195?

listserv: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-39195 being exploited?

CVE-2022-39195 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-2022-39195 affect?

CVE-2022-39195 affects listserv. Severity is medium (CVSS 6.1). A cross-site scripting (XSS) vulnerability in the LISTSERV 17 web interface allows remote attackers to inject arbitrary JavaScript or HTML via the c parameter.

How urgent is CVE-2022-39195?

Priority 50/100. EPSS top 6%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2023-27641 MEDIUM 6.1 UPGRADE The REPORT (after z but before a) parameter in wa.exe in L-Soft LISTSERV 16.5 before 17 allows an attacker to
CVE-2022-40319 HIGH 7.5 DOWNGRADE The LISTSERV 17 web interface allows remote attackers to conduct Insecure Direct Object References (IDOR) atta

References

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