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MEDIUM severity

CVE-2018-1999021 — cms

MEDIUM

CVE-2018-1999021 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in gleez/cms. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Gleez Cms Cross-site Scripting in Profile Page

Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs51th percentile — riskier than 51% of all scored CVEsHighest risk
0.00%0.38%0.77%1.15%0.2%0.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘gleez/cms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐘Packagistgleez/cmsall versionsNo fix

Affected Products

1 product · 1 configurations
Application
gleezcmsgleeztech
1 version
1.3.0
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Gleezcms Gleez Cms version 1.3.0 contains a Cross Site Scripting (XSS) v…

github.comNVDSep 2018

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for gleez/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of gleez/cms for CVE-2018-1999021. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Gleezcms Gleez Cms version 1.3.0 contains a Cross Site Scripting (XSS) vulnerability in Profile page that can result in injection of arbitrary web script or HTML via the profile page editor. The victim must navigate to the attacker's profile page to exploit this vulnerability.
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CVE-2018-1999021: cms XSS (Medium 5.4)