CVE-2023-39000Public exploitNetwork attack vector

Administrator-session compromise via unescaped log-path values

Published Aug 9, 2023 · Updated Oct 10, 2024

Reflected XSS in OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows remote attackers to run JavaScript. LogController::renderPage assigns URL-derived module and scope values to the diagnostics log view without HTML encoding, embedding them in JavaScript contexts. An authenticated administrator must open the crafted URL; the script then runs in the OPNsense origin and can act with that session's privileges.

CVSS severity6.1
Medium
EPSS probability0.57%
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 OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows remote attackers to run JavaScript. LogController::renderPage assigns URL-derived module and scope values to the diagnostics log view without HTML encoding, embedding them in JavaScript contexts. An authenticated administrator must open the crafted URL; the script then runs in the OPNsense origin and can act with that session's privileges.

The record

CVE
CVE-2023-39000
Published
Aug 9, 2023
Updated
Oct 10, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.4LogicalTrustCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
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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