What is CVE-2023-44275?

CVE-2023-44275 is a medium-severity vulnerability in Opnsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-09-28.

How severe is CVE-2023-44275?

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

XSS in Opnsense

CVE-2023-44275

OPNsense before 23.7.5 allows XSS via the index.php column_count parameter to the Lobby Dashboard.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-09-28 · 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 (40.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.5% 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

www.x41-dsec.de/lab/advisories/x41-2023-001-opnsense (Exploit, Third Party Advisory)
github.com/opnsense/core/compare/23.7.4...23.7.5 (Release Notes)
github.com/opnsense/core/commit/484753b2abe3fd0fcdb73d8bf00c3fc3709eb8b7 (Patch)

Frequently asked questions

What is CVE-2023-44275?: CVE-2023-44275 is a medium-severity vulnerability in Opnsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-09-28.
How severe is CVE-2023-44275?: Medium severity. CVSS v3 base score is 5.4 out of 10.