What is CVE-2023-39006?

CVE-2023-39006 is a medium-severity vulnerability in Opnsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-08-09.

How severe is CVE-2023-39006?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Opnsense

CVE-2023-39006

The Crash Reporter (crash_reporter.php) component of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 mishandles input sanitization.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-08-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Opnsense

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/opnsense/core/commit/1c05a19d9d52c7bfa4ac52114935d9fe76d5d181 (Patch)
logicaltrust.net/blog/2023/08/opnsense.html (Exploit, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2023-39006?: CVE-2023-39006 is a medium-severity vulnerability in Opnsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-08-09.
How severe is CVE-2023-39006?: Medium severity. CVSS v3 base score is 5.4 out of 10.