CVE-2020-23689: In YFCMF v2.3.1, there is a stored XSS vulnerability in the comments section of the news page.

Routine

MEDIUM 4.8DOWNGRADE

CVE-2020-23689 is a medium-severity flaw (CVSS 4.8) affecting yfcmf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In YFCMF v2.3.1, there is a stored XSS vulnerability in the comments section of the news page.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-05-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yfcmf

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

Am I affected?

Timeline

2021-05-14 14:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

yfcmf yfcmf DOWNGRADE

Affected: 2.3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.3.1 (Debian / Ubuntu)

apt-cache madison yfcmf sudo apt install yfcmf=<VERSION_BEFORE_2.3.1> sudo apt-mark hold yfcmf

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

dnf --showduplicates list yfcmf sudo dnf downgrade yfcmf-<VERSION_BEFORE_2.3.1> sudo dnf versionlock add yfcmf

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-2020-23689?

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

Is CVE-2020-23689 being exploited?

CVE-2020-23689 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-2020-23689 affect?

CVE-2020-23689 affects yfcmf. Severity is medium (CVSS 4.8). In YFCMF v2.3.1, there is a stored XSS vulnerability in the comments section of the news page.

How urgent is CVE-2020-23689?

Priority 34/100. Public exploit reference

Related CVEs

CVE-2020-23691 CRITICAL 9.8 DOWNGRADE YFCMF v2.3.1 has a Remote Command Execution (RCE) vulnerability in the index.php.
CVE-2018-16431 HIGH 8.8 DOWNGRADE admin/admin/adminsave.html in YFCMF v3.0 allows CSRF to add an administrator account.

References

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