Vulnerabilities in pkg:pypi/Lin-CMS

PACKAGE
Advisory Identifier: GHSA-h6r2-pgvx-683c
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Advisory Summary

CVE-2020-18698 is a CRITICAL (CVSS 9.8) lin-cms-flask vulnerable to improper authentication vulnerability (CWE-307: Improper Restriction of Excessive Authentication Attempts) affecting Lin CMS libraries in the PyPI ecosystem. The issue involves lin-cms-flask vulnerable to improper authentication. Remediation is available in the latest vendor maintenance releases.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/Lin-CMS

2 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-h6r2-pgvx-683c CVE-2020-18698 CRITICAL Lin-CMS-Flask vulnerable to Improper Authentication
GHSA-4vrc-q7m6-vq7w CVE-2022-44244 MODERATE Lin CMS vulnerable to Improper Authentication

CVE-2020-18698 at a Glance

CVE Identifier CVE-2020-18698
GHSA Identifier GHSA-h6r2-pgvx-683c
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-307: Improper Restriction of Excessive Authentication Attempts
Affected Product Lin CMS
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:N/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2020-18698

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-2020-18698, 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-307: Improper Restriction of Excessive Authentication Attempts, where the product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame. 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

Improper Authentication in Lin-CMS-Flask v0.1.1 allows remote attackers to launch brute force login attempts without restriction via the 'login' function in the component `app/api/cms/user.py`.

CVE-2020-18698 Affected Lin CMS Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
Lin-CMS
pypi/Lin-CMS
PyPI
0.1.1
All 1 versions
0.1.1
None specified

References

NVD — CVE-2020-18698 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-18698
Lin CMS Source Repository REPOSITORY
https://github.com/TaleLin/lin-cms-flask/issues/27
MITRE CVE Database — CVE-2020-18698 MITRE
https://cwe.mitre.org/data/definitions/307.html
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-2021-339.yaml

Frequently Asked Questions

What is CVE-2020-18698?
CVE-2020-18698 is a security vulnerability in Lin CMS involving Lin-CMS-Flask vulnerable to Improper Authentication under CWE-307: Improper Restriction of Excessive Authentication Attempts.
Which Lin CMS versions are affected?
Affected versions include releases prior to current release patches across affected packages: Lin-CMS.
What version fixes CVE-2020-18698?
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-2020-18698?
CVE-2020-18698 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-18698?
CVE-2020-18698 is classified under CWE-307: Improper Restriction of Excessive Authentication Attempts (The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.).
How can I check PyPI dependencies for CVE-2020-18698?
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-h6r2-pgvx-683c",
  "modified" : "2026-06-10T18:45:05Z",
  "published" : "2022-05-24T19:11:15Z",
  "aliases" : [ "CVE-2020-18698" ],
  "summary" : "Lin-CMS-Flask vulnerable to Improper Authentication",
  "details" : "Improper Authentication in Lin-CMS-Flask v0.1.1 allows remote attackers to launch brute force login attempts without restriction via the 'login' function in the component `app/api/cms/user.py`.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Lin-CMS"
    },
    "versions" : [ "0.1.1" ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-18698"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TaleLin/lin-cms-flask/issues/27"
  }, {
    "type" : "WEB",
    "url" : "https://cwe.mitre.org/data/definitions/307.html"
  }, {
    "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-2021-339.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-307" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-05-01T16:45:58Z",
    "nvd_published_at" : "2021-08-16T18:15:00Z"
  }
}