CVE-2020-21845: Codoforum 4.8.3 allows HTML Injection in the 'admin dashboard Manage users Section.'

This month

MEDIUM 6.1DOWNGRADE

CVE-2020-21845 is a medium-severity flaw (CVSS 6.1) affecting codoforum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Codoforum 4.8.3 allows HTML Injection in the 'admin dashboard Manage users Section.'

Why this priority

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	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-09-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: codoforum

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

Am I affected?

Timeline

2020-09-14 18:15 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

codoforum codoforum DOWNGRADE

Affected: 4.8.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.8.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.8.3 (Debian / Ubuntu)

apt-cache madison codoforum sudo apt install codoforum=<VERSION_BEFORE_4.8.3> sudo apt-mark hold codoforum

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

dnf --showduplicates list codoforum sudo dnf downgrade codoforum-<VERSION_BEFORE_4.8.3> 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-2020-21845?

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

Is CVE-2020-21845 being exploited?

CVE-2020-21845 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-2020-21845 affect?

CVE-2020-21845 affects codoforum. Severity is medium (CVSS 6.1). Codoforum 4.8.3 allows HTML Injection in the 'admin dashboard Manage users Section.'

How urgent is CVE-2020-21845?

Priority 41/100. Public exploit reference

Related CVEs

CVE-2022-31854 HIGH 7.2 DOWNGRADE Codoforum v5.1 was discovered to contain an arbitrary file upload vulnerability via the logo change option in
CVE-2020-9007 MEDIUM 5.4 DOWNGRADE Codoforum 4.8.8 allows self-XSS via the title of a new topic.
CVE-2020-7051 MEDIUM 6.1 UPGRADE Codologic Codoforum through 4.8.4 allows stored XSS in the login area
CVE-2020-7050 MEDIUM 5.4 UPGRADE Codologic Codoforum through 4.8.4 allows a DOM-based XSS
CVE-2020-5843 MEDIUM 4.8 DOWNGRADE Codoforum 4.8.3 allows XSS in the admin dashboard via a category to the Manage Users screen.

References

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