CVE-2026-49131

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.

References

https://www.vulncheck.com/advisories/opnsense-stored-xss-via-firewall-rule-description-field

https://github.com/opnsense/core/commit/b11d6b340716e240868ab19a369e058a46f0876f

https://docs.opnsense.org/releases/CE_26.1.html#june-02-2026

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS