CVE-2023-4347Public exploitNetwork attack vector

Reflected XSS via unescaped request values

Published Aug 15, 2023 · Updated Oct 3, 2024

Reflected XSS in LibreNMS 23.7.0 and earlier allows remote authenticated users to execute script via crafted web request values. Multiple PHP views interpolate request-derived values directly into HTML or JavaScript without context-appropriate encoding. Exploitation requires a low-privileged account and a victim to open the crafted URL, exposing data and actions available to that browser session.

CVSS severity5.4
Medium
EPSS probability69.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in LibreNMS 23.7.0 and earlier allows remote authenticated users to execute script via crafted web request values. Multiple PHP views interpolate request-derived values directly into HTML or JavaScript without context-appropriate encoding. Exploitation requires a low-privileged account and a victim to open the crafted URL, exposing data and actions available to that browser session.

The record

CVE
CVE-2023-4347
Published
Aug 15, 2023
Updated
Oct 3, 2024
Vendor
LibreNMS
Product
LibreNMS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 2024Record 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 <23.8.0
  2. Affected versionversion=unspecified <23.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LibreNMS · LibreNMSversion=0 <23.8.0; version=unspecified <23.8.0

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
7.6huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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