CVE-2018-1999021: Gleezcms Gleez Cms version 1.3.0 contains a Cross Site Scripting (XSS) vulnerability in Profile page that can

Routine

MEDIUM 5.4DOWNGRADE

CVE-2018-1999021 is a medium-severity flaw (CVSS 5.4) affecting gleezcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Gleezcms Gleez Cms version 1.3.0 contains a Cross Site Scripting (XSS) vulnerability in Profile page that can result in Inject arbitrary web script or HTML via the profile page editor. This attack appear to be exploitable via The victim must navigate to the attacker's profile page.

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	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-07-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: gleeztech

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

Am I affected?

Timeline

2018-07-23 15:29 UTCPublished CVE record published
2026-06-17 01:48 UTCUpdated Record last modified

gleeztech gleezcms DOWNGRADE

Affected: 1.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.0 (Debian / Ubuntu)

apt-cache madison gleezcms sudo apt install gleezcms=<VERSION_BEFORE_1.3.0> sudo apt-mark hold gleezcms

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

dnf --showduplicates list gleezcms sudo dnf downgrade gleezcms-<VERSION_BEFORE_1.3.0> sudo dnf versionlock add gleezcms

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-2018-1999021?

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

Is CVE-2018-1999021 being exploited?

CVE-2018-1999021 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-2018-1999021 affect?

CVE-2018-1999021 affects gleezcms. Severity is medium (CVSS 5.4). Gleezcms Gleez Cms version 1.3.0 contains a Cross Site Scripting (XSS) vulnerability in Profile page that can result in Inject arbitrary web script or HTML via the profile page editor. This attack appear to be exploitable via The victim mus

How urgent is CVE-2018-1999021?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2018-16704 MEDIUM 4.3 DOWNGRADE An issue was discovered in Gleez CMS v1.2.0

References

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