GHSA-74r7-3mjm-jc5v: eduMFA Unauthenticated Failcounter Increment On Resolver Vulnerability

MODERATE
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CVSS 6.5
CWE-20
Published
Advisory Summary

GHSA-74r7-3mjm-jc5v is a MODERATE (CVSS 6.5) unauthenticated failcounter increment on resolver vulnerability (CWE-20: Improper Input Validation) affecting eduMFA libraries in the PyPI ecosystem. The issue involves unauthenticated failcounter increment on resolver tokens via /validate/check. Remediation is available by upgrading affected packages to version 2.9.1.

GHSA-74r7-3mjm-jc5v at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-74r7-3mjm-jc5v
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-20: Improper Input Validation
Affected Product eduMFA
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

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

How to Fix GHSA-74r7-3mjm-jc5v

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

edumfa fixed: 2.9.1 
pip install edumfa>=2.9.1
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 edumfa

How to Check if You Are Affected

To determine whether your Python environment is affected by GHSA-74r7-3mjm-jc5v, inspect your installed packages using pip:

pip show edumfa

Analyze the terminal output to locate any version of eduMFA in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.9.1), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In eduMFA, 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

### Impact If the resolver parameter is passed, but the user does not exist, all failcounters of tokens in that resolver will be increased. ### Patches This, along with other issues, was fixed in eduMFA v2.9.1. ### Workarounds Limiting access to `/validate/check` to client applications (i.e. Shibboleth/FreeRADIUS) using an authorization policy with `api_key_required` or using e.g. the reverse proxy.

GHSA-74r7-3mjm-jc5v Affected eduMFA Versions

1 component(s)
Fixed Versions:
2.9.1
Product / Package Ecosystem Affected Versions Fixed Version
edumfa
pypi/edumfa
PyPI
< 2.9.1
2.9.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/eduMFA/eduMFA/security/advisories/GHSA-74r7-3mjm-jc5v
eduMFA Source Repository REPOSITORY
https://github.com/eduMFA/eduMFA

Frequently Asked Questions

What is GHSA-74r7-3mjm-jc5v?
GHSA-74r7-3mjm-jc5v is a security vulnerability in eduMFA involving Unauthenticated Failcounter Increment on Resolver Tokens via /validate/check under CWE-20: Improper Input Validation.
Which eduMFA versions are affected?
Affected versions include releases prior to 2.9.1 across affected packages: edumfa.
What version fixes GHSA-74r7-3mjm-jc5v?
Upgrading to 2.9.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is edumfa affected?
Yes, edumfa is affected in releases prior to 2.9.1. Upgrade your dependency to 2.9.1 or later.
What is the CVSS score of GHSA-74r7-3mjm-jc5v?
GHSA-74r7-3mjm-jc5v has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with GHSA-74r7-3mjm-jc5v?
GHSA-74r7-3mjm-jc5v is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check PyPI dependencies for GHSA-74r7-3mjm-jc5v?
Run the dependency tree command: 'pip show edumfa'. 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-74r7-3mjm-jc5v",
  "modified" : "2026-05-18T15:35:42Z",
  "published" : "2026-05-18T15:35:42Z",
  "aliases" : [ ],
  "summary" : "eduMFA: Unauthenticated Failcounter Increment on Resolver Tokens via /validate/check",
  "details" : "### Impact\nIf the resolver parameter is passed, but the user does not exist, all failcounters of tokens in that resolver will be increased.\n\n### Patches\nThis, along with other issues, was fixed in eduMFA v2.9.1.\n\n### Workarounds\nLimiting access to `/validate/check` to client applications (i.e. Shibboleth/FreeRADIUS) using an authorization policy with `api_key_required` or using e.g. the reverse proxy.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "edumfa"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.9.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/eduMFA/eduMFA/security/advisories/GHSA-74r7-3mjm-jc5v"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/eduMFA/eduMFA"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-18T15:35:42Z",
    "nvd_published_at" : null
  }
}