CVE-2020-22539: An arbitrary file upload vulnerability in the Add Category function of Codoforum v4.9 allows attackers to exec

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HIGH 7.2DOWNGRADE

CVE-2020-22539 is a high-severity flaw (CVSS 7.2) affecting codoforum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An arbitrary file upload vulnerability in the Add Category function of Codoforum v4.9 allows attackers to execute arbitrary code via uploading a crafted file.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-434
Published	2024-04-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: codologic

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

Am I affected?

Timeline

2024-04-15 22:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

codologic codoforum DOWNGRADE

Affected: 4.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.9 (Debian / Ubuntu)

apt-cache madison codoforum sudo apt install codoforum=<VERSION_BEFORE_4.9> sudo apt-mark hold codoforum

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

dnf --showduplicates list codoforum sudo dnf downgrade codoforum-<VERSION_BEFORE_4.9> sudo dnf versionlock add codoforum

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-2020-22539?

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

Is CVE-2020-22539 being exploited?

CVE-2020-22539 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-2020-22539 affect?

CVE-2020-22539 affects codoforum. Severity is high (CVSS 7.2). An arbitrary file upload vulnerability in the Add Category function of Codoforum v4.9 allows attackers to execute arbitrary code via uploading a crafted file.

How urgent is CVE-2020-22539?

Priority 45/100. High severity; Public exploit reference

Related CVEs

CVE-2020-22540 MEDIUM 5.4 DOWNGRADE Stored Cross-Site Scripting (XSS) vulnerability in Codoforum v4.9, allows attackers to execute arbitrary code

References

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