CVE-2020-24036: PHP object injection in the Ajax endpoint of the backend in ForkCMS below version 5.8.3 allows an authenticate

Q: How do I fix CVE-2020-24036?

fork cms: upgrade to 5.8.3. Exact commands for each OS are on this page.

Q: Is CVE-2020-24036 being exploited?

CVE-2020-24036 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-2020-24036 affect?

CVE-2020-24036 affects fork cms. Severity is high (CVSS 8.8). PHP object injection in the Ajax endpoint of the backend in ForkCMS below version 5.8.3 allows an authenticated remote user to execute malicious code.

Q: How urgent is CVE-2020-24036?

Priority 58/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2020-24036 is a high-severity flaw (CVSS 8.8) affecting fork cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHP object injection in the Ajax endpoint of the backend in ForkCMS below version 5.8.3 allows an authenticated remote user to execute malicious code.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-502
Published	2021-03-04
Last modified	2026-07-09

Publisher (CNA): MITRE · Vendor: fork-cms

Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-03-04 13:15 UTCPublished CVE record published
2026-07-09 00:17 UTCUpdated Record last modified

fork-cms fork cms UPGRADE

Affected: < 5.8.3

Fixed in: 5.8.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fork-cms || rpm -q fork-cms || fork-cms --version

2. UPGRADE to 5.8.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fork-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fork-cms

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-2020-24036?

fork cms: upgrade to 5.8.3. Exact commands for each OS are on this page.

Is CVE-2020-24036 being exploited?

CVE-2020-24036 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-2020-24036 affect?

CVE-2020-24036 affects fork cms. Severity is high (CVSS 8.8). PHP object injection in the Ajax endpoint of the backend in ForkCMS below version 5.8.3 allows an authenticated remote user to execute malicious code.

How urgent is CVE-2020-24036?

Priority 58/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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References

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