CVE-2024-55374Network attack vector

Unauthenticated username enumeration via distinct login errors

Published Jan 2, 2026 · Updated Jan 2, 2026

Observable discrepancy in REDCap 14.3.13 allows remote attackers to enumerate usernames through unauthenticated login attempts. The login handler returns distinct error messages depending on whether the submitted username exists, exposing an account-validity oracle. No account or user interaction is required, and the disclosed usernames can support targeted password-guessing attacks.

CVSS severity5.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Observable discrepancy in REDCap 14.3.13 allows remote attackers to enumerate usernames through unauthenticated login attempts. The login handler returns distinct error messages depending on whether the submitted username exists, exposing an account-validity oracle. No account or user interaction is required, and the disclosed usernames can support targeted password-guessing attacks.

The record

CVE
CVE-2024-55374
Published
Jan 2, 2026
Updated
Jan 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-203, T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-203Observable Discrepancy
T1087Account Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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