CVE-2021-45843: glFusion CMS v1.7.9 is affected by a reflected Cross Site Scripting (XSS) vulnerability

Routine

MEDIUM 6.1DOWNGRADE

CVE-2021-45843 is a medium-severity flaw (CVSS 6.1) 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 a reflected Cross Site Scripting (XSS) vulnerability. The value of the title request parameter is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. This input was echoed unmodified in the application's response.

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	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-09-29
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

2022-09-29 03:15 UTCPublished CVE record published
2026-06-17 04:14 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-2021-45843?

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

Is CVE-2021-45843 being exploited?

CVE-2021-45843 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-2021-45843 affect?

CVE-2021-45843 affects glfusion. Severity is medium (CVSS 6.1). glFusion CMS v1.7.9 is affected by a reflected Cross Site Scripting (XSS) vulnerability. The value of the title request parameter is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. This input

How urgent is CVE-2021-45843?

Priority 39/100. Public exploit reference

Related CVEs

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-2021-44937 MEDIUM 5.3 DOWNGRADE glFusion CMS v1.7.9 is affected by an arbitrary user registration vulnerability in /public_html/users.php
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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