CVE-2020-23049: Fork CMS Content Management System v5.8.0 was discovered to contain a cross-site scripting (XSS) vulnerability

Routine

MEDIUM 5.4DOWNGRADE

CVE-2020-23049 is a medium-severity flaw (CVSS 5.4) affecting fork cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Fork CMS Content Management System v5.8.0 was discovered to contain a cross-site scripting (XSS) vulnerability in the `Displayname` field when using the `Add`, `Edit` or `Register' functions. This vulnerability allows attackers to execute arbitrary web scripts or HTML.

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	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-10-22
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2021-10-22 20:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

fork-cms fork cms DOWNGRADE

Affected: 5.8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.8.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.8.0 (Debian / Ubuntu)

apt-cache madison fork-cms sudo apt install fork-cms=<VERSION_BEFORE_5.8.0> sudo apt-mark hold fork-cms

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

dnf --showduplicates list fork-cms sudo dnf downgrade fork-cms-<VERSION_BEFORE_5.8.0> sudo dnf versionlock add fork-cms

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-2020-23049?

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

Is CVE-2020-23049 being exploited?

CVE-2020-23049 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-2020-23049 affect?

CVE-2020-23049 affects fork cms. Severity is medium (CVSS 5.4). Fork CMS Content Management System v5.8.0 was discovered to contain a cross-site scripting (XSS) vulnerability in the `Displayname` field when using the `Add`, `Edit` or `Register' functions. This vulnerability allows attackers to execute a

How urgent is CVE-2020-23049?

Priority 36/100. Public exploit reference

Related CVEs

CVE-2020-24036 HIGH 8.8 UPGRADE PHP object injection in the Ajax endpoint of the backend in ForkCMS below version 5.8.3 allows an authenticate
CVE-2022-35590 MEDIUM 4.8 DOWNGRADE A cross-site scripting (XSS) issue in the ForkCMS version 5.9.3 allows remote attackers to inject JavaScript v
CVE-2022-35589 MEDIUM 4.8 DOWNGRADE A cross-site scripting (XSS) issue in the Fork version 5.9.3 allows remote attackers to inject JavaScript via
CVE-2022-35587 MEDIUM 4.8 DOWNGRADE A cross-site scripting (XSS) issue in the Fork version 5.9.3 allows remote attackers to inject JavaScript via
CVE-2022-35585 MEDIUM 4.8 DOWNGRADE A stored cross-site scripting (XSS) issue in the ForkCMS version 5.9.3 allows remote attackers to inject JavaS

References

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