Vulnerabilities in pkg:pypi/lin-cms

PACKAGE
Advisory Identifier: GHSA-rvf8-c35m-8289
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Advisory Summary

CVE-2020-18699 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Lin cms libraries in the PyPI ecosystem. The issue involves lin-cms-flask cross site scripting (xss) vulnerability. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/lin-cms

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/lin-cms. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-rvf8-c35m-8289 CVE-2020-18699 MODERATE Lin-CMS-Flask Cross Site Scripting (XSS) vulnerability

CVE-2020-18699 at a Glance

CVE Identifier CVE-2020-18699
GHSA Identifier GHSA-rvf8-c35m-8289
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Lin cms
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-18699

To remediate this vulnerability, upgrade all affected Lin cms dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

lin-cms fixed: Latest secure release 
pip install lin-cms>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show lin-cms

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-18699, inspect your installed packages using pip:

pip show lin-cms

Analyze the terminal output to locate any version of Lin cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show lin-cms command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Lin cms, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Cross Site Scripting (XSS) in Lin-CMS-Flask v0.1.1 allows remote attackers to execute arbitrary code by entering scripts in the the 'Username' parameter of the in component 'app/api/cms/user.py'.

CVE-2020-18699 Affected Lin cms Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
lin-cms
pypi/lin-cms
PyPI
≤ 0.1.1b2

References

NVD — CVE-2020-18699 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-18699
Lin cms Source Repository REPOSITORY
https://github.com/TaleLin/lin-cms-flask/issues/28
Lin cms Source Repository REPOSITORY
https://github.com/TaleLin/lin-cms-flask
Lin cms Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/lin-cms/PYSEC-2021-340.yaml

Frequently Asked Questions

What is CVE-2020-18699?
CVE-2020-18699 is a security vulnerability in Lin cms involving Lin-CMS-Flask Cross Site Scripting (XSS) vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Lin cms versions are affected?
Affected versions include releases prior to current release patches across affected packages: lin-cms.
What version fixes CVE-2020-18699?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is lin-cms affected?
Yes, lin-cms is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2020-18699?
CVE-2020-18699 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-18699?
CVE-2020-18699 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check PyPI dependencies for CVE-2020-18699?
Run the dependency tree command: 'pip show lin-cms'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rvf8-c35m-8289",
  "modified" : "2026-06-10T18:45:39Z",
  "published" : "2022-05-24T19:11:15Z",
  "aliases" : [ "CVE-2020-18699" ],
  "summary" : "Lin-CMS-Flask Cross Site Scripting (XSS) vulnerability",
  "details" : "Cross Site Scripting (XSS) in Lin-CMS-Flask v0.1.1 allows remote attackers to execute arbitrary code by entering scripts in the the 'Username' parameter of the in component 'app/api/cms/user.py'.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "lin-cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.1.1b2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-18699"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TaleLin/lin-cms-flask/issues/28"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/TaleLin/lin-cms-flask"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/lin-cms/PYSEC-2021-340.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-29T12:00:14Z",
    "nvd_published_at" : "2021-08-16T18:15:00Z"
  }
}