CVE-2024-42939: A cross-site scripting (XSS) vulnerability in the component /index/index.html of YZNCMS v1.4.2 allows attacker

Routine

MEDIUM 5.4DOWNGRADE

CVE-2024-42939 is a medium-severity flaw (CVSS 5.4) affecting yzncms. 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 component /index/index.html of YZNCMS v1.4.2 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the configured remarks text field.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-08-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yzncms

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

Am I affected?

Timeline

2024-08-21 05:15 UTCPublished CVE record published
2026-06-17 07:50 UTCUpdated Record last modified

yzncms yzncms DOWNGRADE

Affected: 1.4.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.4.2 (Debian / Ubuntu)

apt-cache madison yzncms sudo apt install yzncms=<VERSION_BEFORE_1.4.2> sudo apt-mark hold yzncms

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

dnf --showduplicates list yzncms sudo dnf downgrade yzncms-<VERSION_BEFORE_1.4.2> sudo dnf versionlock add yzncms

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.

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-2024-42939?

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

Is CVE-2024-42939 being exploited?

CVE-2024-42939 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-2024-42939 affect?

CVE-2024-42939 affects yzncms. Severity is medium (CVSS 5.4). A cross-site scripting (XSS) vulnerability in the component /index/index.html of YZNCMS v1.4.2 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the configured remarks text field.

How urgent is CVE-2024-42939?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2025-25791 MEDIUM 4.4 DOWNGRADE An arbitrary file upload vulnerability in the plugin installation feature of YZNCMS v2.0.1 allows attackers to

References

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