CVE-2023-40932Network attack vector

Credential theft via stored logo alt-text script

Published Sep 19, 2023 · Updated Jul 9, 2026

Stored XSS in the Custom Logo component in Nagios XI 5.11.1 and earlier allows remote authenticated users to execute JavaScript. The Custom Logo alt-text field accepts arbitrary JavaScript or HTML, and the shared navbar renders that content without neutralization. Access to the component is required; loading an affected page, including the login page, exposes page data and entered credentials.

CVSS severity5.4
Medium
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the Custom Logo component in Nagios XI 5.11.1 and earlier allows remote authenticated users to execute JavaScript. The Custom Logo alt-text field accepts arbitrary JavaScript or HTML, and the shared navbar renders that content without neutralization. Access to the component is required; loading an affected page, including the login page, exposes page data and entered credentials.

The record

CVE
CVE-2023-40932
Published
Sep 19, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1056.003
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

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1056.003Input Capture: Web Portal Capture

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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