XSS in Deciso B.v. Opnsense
CVE-2026-49132
OPNsense before 26.1.9 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject arbitrary HTML or JavaScript by embedding payloads in the certificate description field via the trust certificate API. The unsanitized description value is persisted and later rendered in the Dashboard Certificates widget through Certificates.js, which interpolates the raw value into HTML attribute and text content sinks without encoding, causing injected scripts to execute in the browser of any authenticated user who views the Dashboard, enabling session hijacking or credential theft.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.001 (1.5th percentile) — read the EPSS interpretation.
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.
Affected products
- Deciso B.v. Opnsense — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (release-notes)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-49132?
- CVE-2026-49132 is a medium-severity vulnerability in Deciso B.v. Opnsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-08-03.
- How severe is CVE-2026-49132?
- Medium severity. CVSS v3 base score is 5.4 out of 10.