CVE-2023-5443Network attack vector

Unauthenticated account enumeration via outbound error messages

Published Oct 27, 2023 · Updated May 21, 2026

Improper outbound error-message protection in EDM Informatics E-invoice before 2.1 allows remote attackers to enumerate accounts. The public CNA record and government advisory do not identify the affected endpoint or explain how its response distinguishes valid accounts. No authentication or user interaction is required; the confirmed consequence is account footprinting rather than data modification or service interruption.

CVSS severity7.5
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper outbound error-message protection in EDM Informatics E-invoice before 2.1 allows remote attackers to enumerate accounts. The public CNA record and government advisory do not identify the affected endpoint or explain how its response distinguishes valid accounts. No authentication or user interaction is required; the confirmed consequence is account footprinting rather than data modification or service interruption.

The record

CVE
CVE-2023-5443
Published
Oct 27, 2023
Updated
May 21, 2026
Vendor
EDM Bilişim Sistemleri Danışmanlık Hizmetleri A.Ş.
Product
E-Fatura
Classifications
CWE-1320, CAPEC-575, T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 27, 2023CVE publishedPublication date reported by the CVE source.
  2. May 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EDM Bilişim Sistemleri Danışmanlık Hizmetleri A.Ş. · E-Faturaversion=0 <2.1

Published CVSS scores

7.5TR-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-1320Improper Protection for Outbound Error Messages and Alert Signals
CAPEC-575Account Footprinting
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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