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MEDIUM severity

CVE-2020-21146 — cms

MEDIUMFix: liufee/cms@e92f687

CVE-2020-21146 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in feehi/cms. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for feehi/cms — see the affected versions and patch details below.

Feehi CMS vulnerable to Cross-site Scripting in Username Field

Also known asGHSA-v762-47vh-j7q3
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk
0.00%0.42%0.84%1.27%0.3%0.8%May 26Aug 26Oct 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
🐘feehi/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

Feehi CMS 2.0.8 is affected by a cross-site scripting (XSS) vulnerability. When the user name is inserted as JavaScript code, browsing the post will trigger the XSS.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistfeehi/cmsall versions2.0.8.1composer require feehi/cms:^2.0.8.1

Affected Products

1 product · 1 configurations
Application
feehi cmsfeehi
1 version
2.0.8
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.

Feehi CMS 2.0.8 is affected by a cross-site scripting (XSS) vulnerabilit…

github.comNVDJan 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update feehi/cms to 2.0.8.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-21146 is resolved across your whole dependency graph.

  3. Workarounds

    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

Feehi CMS 2.0.8 is affected by a cross-site scripting (XSS) vulnerability. When the user name is inserted as JavaScript code, browsing the post will trigger the XSS.
O3 Security · Impact-Aware SCA

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CVE-2020-21146: cms XSS — Fixed in 2.0.8.1