CVE-2023-39002Public exploitNetwork attack vector

Reflected script execution via unescaped act parameter

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 attackers to run browser scripts via a crafted URL. system_certmanager.php places the act parameter into a hidden input value without HTML-escaping it, allowing the value attribute to be broken and attacker-controlled markup to enter the response. Execution requires an authenticated administrator to follow the crafted URL; the resulting script runs in the administrator's OPNsense origin and can act through that session.

CVSS severity6.1
Medium
EPSS probability1.20%
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 attackers to run browser scripts via a crafted URL. system_certmanager.php places the act parameter into a hidden input value without HTML-escaping it, allowing the value attribute to be broken and attacker-controlled markup to enter the response. Execution requires an authenticated administrator to follow the crafted URL; the resulting script runs in the administrator's OPNsense origin and can act through that session.

The record

CVE
CVE-2023-39002
Published
Aug 9, 2023
Updated
Oct 10, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
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

6.1NVDCVSS: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.

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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')
T1189Drive-by Compromise

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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