Description

OPNsense before 26.1.9 contains a stored cross-site scripting vulnerability that allows authenticated attackers with firewall rule management privileges to inject arbitrary HTML or JavaScript by embedding payloads in the firewall rule description field via the filter API endpoint. The unsanitized description value is persisted and later rendered through the default cell formatter in opnsense_bootgrid.js, which assigns raw cell content to innerHTML, causing injected scripts to execute in the browser of any authenticated user who views the Firewall Rules page, enabling session hijacking or credential theft.

Severity (CVSS)

Base score5.1
SeverityMedium
VersionCVSS 4.0
VectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Provided byCNA

Weaknesses

  • CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected products

VendorProductVersions
Deciso B.V.OPNsense0 to <26.1.9

References

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 04 Aug 2026 07:02 UTC.