CVE-2026-49132

OPNsense < 26.1.9 Stored XSS via Certificate Description Field

Published: Aug 3, 2026Updated: Sep 16, 2026 Sources: CVE List NVDCWE-79

5.4MEDIUM

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

Open in CVSS calculator →

Weaknesses

CWE-79

Affected Products

Deciso B.V.

OPNsense

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Is your org exposed to CVE-2026-49132?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques

Execution

Initial Access

View detailed technique mapping

References

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

docs.opnsense.org

https://github.com/opnsense/core/commit/12b021ff11db38705e92ac4c9af5e07d602da6ba

github.com

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

vulncheck.com

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-49132 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows