CVE-2025-34278Network attack vector

Stored XSS via percentile calculator payload rendering

Published Oct 30, 2025 · Updated Nov 17, 2025

Stored XSS in Nagios Network Analyzer before 2024R1 allows remote authenticated users to run script in another user's browser. The Source Groups percentile calculator menu stores attacker-supplied content and later renders it as executable page content. Low-privilege access and a victim viewing the affected page are required, exposing data and actions available to the rendered script.

CVSS severity5.1
Medium
EPSS probability0.70%
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 Nagios Network Analyzer before 2024R1 allows remote authenticated users to run script in another user's browser. The Source Groups percentile calculator menu stores attacker-supplied content and later renders it as executable page content. Low-privilege access and a victim viewing the affected page are required, exposing data and actions available to the rendered script.

The record

CVE
CVE-2025-34278
Published
Oct 30, 2025
Updated
Nov 17, 2025
Vendor
Nagios Enterprises, LLC
Product
Nagios Network Analyzer
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <2024R1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nagios Enterprises, LLC · Nagios Network Analyzerversion=0 <2024R1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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')
T1059.007JavaScript/JScript

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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