CVE-2023-50453Network attack vector

Unauthenticated configuration disclosure via public signshow endpoint

Published Dec 10, 2023 · Updated Aug 2, 2024

Information disclosure in Zammad before 6.2.0 allows remote attackers to read internal user-attribute configuration via a public endpoint. The login screen calls /api/v1/signshow without authentication, and the endpoint returns internal user-object attribute metadata, including selectable values. No account or user interaction is required; exposure is limited to the configuration metadata reported by the vendor, with no integrity or availability impact.

CVSS severity5.3
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Information disclosure in Zammad before 6.2.0 allows remote attackers to read internal user-attribute configuration via a public endpoint. The login screen calls /api/v1/signshow without authentication, and the endpoint returns internal user-object attribute metadata, including selectable values. No account or user interaction is required; exposure is limited to the configuration metadata reported by the vendor, with no integrity or availability impact.

The record

CVE
CVE-2023-50453
Published
Dec 10, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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

5.3NVDCVSS: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

T1190Exploit Public-Facing Application

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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