CVE-2023-0869

Session-data disclosure via unescaped query parameter names

Published Feb 23, 2023 · Updated Aug 2, 2024

Cross-site scripting in affected OpenNMS Meridian and Horizon releases allows attackers to read confidential session information. Util.makeQueryString URL-encodes parameter values but appends request parameter names verbatim when it rebuilds links for outage/list.htm. An attacker must supply a crafted parameter name and induce an authenticated intranet user to follow the generated link, allowing script execution in that user's browser and access to session information.

CVSS severity5.8
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in affected OpenNMS Meridian and Horizon releases allows attackers to read confidential session information. Util.makeQueryString URL-encodes parameter values but appends request parameter names verbatim when it rebuilds links for outage/list.htm. An attacker must supply a crafted parameter name and induce an authenticated intranet user to follow the generated link, allowing script execution in that user's browser and access to session information.

The record

CVE
CVE-2023-0869
Published
Feb 23, 2023
Updated
Aug 2, 2024
Vendor
The OpenNMS Group, Inc.
Product
OpenNMS Meridian
Classifications
CWE-20, CWE-79, T1539
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=2022.1.0 <2023.1.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

The OpenNMS Group, Inc. · OpenNMS Meridianversion=2022.1.0 <2023.1.0
The OpenNMS Group, Inc. · OpenNMS Horizonversion=29.0.0 <31.0.4

Published CVSS scores

6.1National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.8The OpenNMS Group, Inc.CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/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)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

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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