CVE-2018-16431: admin/admin/adminsave.html in YFCMF v3.0 allows CSRF to add an administrator account.

This month

HIGH 8.8DOWNGRADE

CVE-2018-16431 is a high-severity flaw (CVSS 8.8) affecting yfcmf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

admin/admin/adminsave.html in YFCMF v3.0 allows CSRF to add an administrator account.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-352
Published	2018-09-04
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

2018-09-04 00:29 UTCPublished CVE record published
2026-06-17 01:44 UTCUpdated Record last modified

yfcmf yfcmf DOWNGRADE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison yfcmf sudo apt install yfcmf=<VERSION_BEFORE_3.0> sudo apt-mark hold yfcmf

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

dnf --showduplicates list yfcmf sudo dnf downgrade yfcmf-<VERSION_BEFORE_3.0> 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-2018-16431?

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

Is CVE-2018-16431 being exploited?

CVE-2018-16431 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-2018-16431 affect?

CVE-2018-16431 affects yfcmf. Severity is high (CVSS 8.8). admin/admin/adminsave.html in YFCMF v3.0 allows CSRF to add an administrator account.

How urgent is CVE-2018-16431?

Priority 50/100. High severity; 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-2020-23689 MEDIUM 4.8 DOWNGRADE In YFCMF v2.3.1, there is a stored XSS vulnerability in the comments section of the news page.

References

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