CVE-2024-12503: A vulnerability classified as problematic was found in ClassCMS 4.8

Routine

LOW 2.4DOWNGRADE

CVE-2024-12503 is a low-severity flaw (CVSS 2.4) affecting classcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability classified as problematic was found in ClassCMS 4.8. Affected by this vulnerability is an unknown functionality of the file /index.php/admin of the component Model Management Page. The manipulation of the argument URL leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	2.4 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-79, CWE-94
Published	2024-12-12
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: classcms

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

Am I affected?

Timeline

2024-12-12 02:15 UTCPublished CVE record published
2026-06-17 06:59 UTCUpdated Record last modified

classcms classcms DOWNGRADE

Affected: 4.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.8 (Debian / Ubuntu)

apt-cache madison classcms sudo apt install classcms=<VERSION_BEFORE_4.8> sudo apt-mark hold classcms

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

dnf --showduplicates list classcms sudo dnf downgrade classcms-<VERSION_BEFORE_4.8> sudo dnf versionlock add classcms

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-2024-12503?

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

Is CVE-2024-12503 being exploited?

CVE-2024-12503 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-2024-12503 affect?

CVE-2024-12503 affects classcms. Severity is low (CVSS 2.4). A vulnerability classified as problematic was found in ClassCMS 4.8. Affected by this vulnerability is an unknown functionality of the file /index.php/admin of the component Model Management Page. The manipulation of the argument URL leads

How urgent is CVE-2024-12503?

Priority 24/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2024-8145 LOW 2.4 DOWNGRADE A vulnerability, which was classified as problematic, has been found in ClassCMS 4.8
CVE-2024-8144 LOW 3.5 DOWNGRADE A vulnerability classified as problematic was found in ClassCMS 4.8
CVE-2024-6932 LOW 3.5 DOWNGRADE A vulnerability was found in ClassCMS 4.5
CVE-2024-57099 CRITICAL 9.8 DOWNGRADE ClassCMS v4.8 has a code execution vulnerability
CVE-2024-57097 MEDIUM 4.8 DOWNGRADE ClassCMS 4.8 is vulnerable to Cross Site Scripting (XSS) in class/admin/channel.php.

References

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