CVE-2023-40312Network attack vector

Browser script execution via unsanitized JSP parameters

Published Aug 14, 2023 · Updated Sep 27, 2024

Reflected XSS in OpenNMS Horizon 31.0.8 through 32.0.1 and affected Meridian releases allows remote attackers to run script in users' browsers. Multiple JSPs interpolate request parameters and the User-Agent header into HTML, URLs, attributes, and JavaScript without WebSecurityUtils sanitization. An attacker must reach the protected intranet web UI and induce a signed-in user to open a crafted request, enabling browser-context data access or actions with that user's session.

CVSS severity6.7
Medium
EPSS probability0.64%
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 OpenNMS Horizon 31.0.8 through 32.0.1 and affected Meridian releases allows remote attackers to run script in users' browsers. Multiple JSPs interpolate request parameters and the User-Agent header into HTML, URLs, attributes, and JavaScript without WebSecurityUtils sanitization. An attacker must reach the protected intranet web UI and induce a signed-in user to open a crafted request, enabling browser-context data access or actions with that user's session.

The record

CVE
CVE-2023-40312
Published
Aug 14, 2023
Updated
Sep 27, 2024
Vendor
The OpenNMS Group, Inc.
Product
OpenNMS Meridian
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 27, 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?

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

  1. Affected versionversion=2020.0.0 <=2020.1.37
  2. Affected versionversion=2021.0.0 <=2021.1.29
  3. Affected versionversion=2022.0.0 <=2022.1.18
  4. Affected versionversion=2023.0.0 <=2023.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The OpenNMS Group, Inc. · OpenNMS Meridianversion=2020.0.0 <=2020.1.37; version=2021.0.0 <=2021.1.29; version=2022.0.0 <=2022.1.18; version=2023.0.0 <=2023.1.5
The OpenNMS Group, Inc. · OpenNMS Horizonversion=31.0.8 <32.0.2

Published CVSS scores

5.2NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.7The OpenNMS GroupCVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

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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