CVE-2023-40931Public exploitNetwork attack vector

Sensitive data disclosure via unsanitized banner ID

Published Sep 19, 2023 · Updated Jul 9, 2026

SQL injection in Nagios XI 5.11.0 through 5.11.1 allows remote authenticated users to read sensitive database data via a crafted ID. The banner acknowledgement endpoint passes its client-supplied ID parameter into a database query without sanitization. A low-privileged account is sufficient, and no valid banner must exist; exposed records include usernames, password hashes, API tokens, and backend tickets.

CVSS severity6.5
Medium
EPSS probability11.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Nagios XI 5.11.0 through 5.11.1 allows remote authenticated users to read sensitive database data via a crafted ID. The banner acknowledgement endpoint passes its client-supplied ID parameter into a database query without sanitization. A low-privileged account is sufficient, and no valid banner must exist; exposed records include usernames, password hashes, API tokens, and backend tickets.

The record

CVE
CVE-2023-40931
Published
Sep 19, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

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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