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eduMFA: Unauthenticated Failcounter Increment on Resolver Tokens via /validate/check

Moderate severity GitHub Reviewed Published May 11, 2026 in eduMFA/eduMFA • Updated May 18, 2026

Package

pip edumfa (pip)

Affected versions

< 2.9.1

Patched versions

2.9.1

Description

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.

References

@aleyna72072 aleyna72072 published to eduMFA/eduMFA May 11, 2026
Published to the GitHub Advisory Database May 18, 2026
Reviewed May 18, 2026
Last updated May 18, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

Weaknesses

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. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-74r7-3mjm-jc5v

Source code

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