CVE-2021-44937: glFusion CMS v1.7.9 is affected by an arbitrary user registration vulnerability in /public_html/users.php

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2021-44937 is a medium-severity flaw (CVSS 5.3) affecting glfusion. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

glFusion CMS v1.7.9 is affected by an arbitrary user registration vulnerability in /public_html/users.php. An attacker can register with the mailbox of any user. When users want to register, they will find that the mailbox has been occupied.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-287
Published	2021-12-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: glfusion

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

Am I affected?

Timeline

2021-12-14 13:15 UTCPublished CVE record published
2026-06-17 04:12 UTCUpdated Record last modified

glfusion glfusion DOWNGRADE

Affected: 1.7.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7.9 (Debian / Ubuntu)

apt-cache madison glfusion sudo apt install glfusion=<VERSION_BEFORE_1.7.9> sudo apt-mark hold glfusion

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

dnf --showduplicates list glfusion sudo dnf downgrade glfusion-<VERSION_BEFORE_1.7.9> sudo dnf versionlock add glfusion

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-2021-44937?

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

Is CVE-2021-44937 being exploited?

CVE-2021-44937 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-2021-44937 affect?

CVE-2021-44937 affects glfusion. Severity is medium (CVSS 5.3). glFusion CMS v1.7.9 is affected by an arbitrary user registration vulnerability in /public_html/users.php. An attacker can register with the mailbox of any user. When users want to register, they will find that the mailbox has been occupied

How urgent is CVE-2021-44937?

Priority 42/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-45843 MEDIUM 6.1 DOWNGRADE glFusion CMS v1.7.9 is affected by a reflected Cross Site Scripting (XSS) vulnerability
CVE-2021-44949 CRITICAL 9.8 DOWNGRADE glFusion CMS 1.7.9 is affected by an access control vulnerability via /public_html/users.php.
CVE-2021-44942 MEDIUM 4.3 DOWNGRADE glFusion CMS 1.7.9 is affected by a Cross Site Request Forgery (CSRF) vulnerability in /public_html/admin/plug
CVE-2021-44935 CRITICAL 9.1 DOWNGRADE glFusion CMS v1.7.9 is affected by an arbitrary user impersonation vulnerability in /public_html/comment.php

References

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