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Vulnerabilities

Security incident · GHSA-9h93-hhcx-957c

Multiple cross-site scripting (XSS) in OPNsense 26.7.1_1 Architecture amd64 08d6a7847

Published Aug 12, 2026 · catalog updated Aug 12, 2026 · Multiple cross-site scripting (XSS)

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for GHSA-9h93-hhcx-957c. A missing EPSS score is not a low risk. Compare Multiple cross-site scripting (XSS) with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Multiple cross-site scripting (XSS)).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Low—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Not established
Affected products
See sources for product scope

### Summary Brian Mariani from DigitalCanion SA identified at least two XSS vulnerabilities in **OPNsense 26.7.1_1.** One of them is a Stored XSS vulnerability. It allows an attacker to store malicious JavaScript code within the application. Every user who logs into the application, including users with root privileges, may be affected when the stored payload is rendered. The second vulnerability is a Reflected XSS, where the malicious JavaScript code is reflected in the application's response and executed in the victim's browser. ### Details The Stored XSS vulnerability can be found under **Interfaces → Assignments, in the Description field.** An attacker can inject arbitrary JavaScript code into this field. For example, the following payload can be used to demonstrate the vulnerability: **'> alert('xss') ** The injected JavaScript code is executed when the affected data is subsequently rendered by the application. The impact can be observed across multiple pages that display the interface configuration, including Dashboard and Interfaces → Overview. The second XSS is a reflected one, and can be found on **Firewall: Log Files: Live View.** When injecting javascript code onto the search field and press the Apply button, javascript code is executed inmediatly. ### PoC You can reproduce the vulnerability as explained in details item. ### Impact _What kind of vulnerability is it? Who is impacted?_ Cross Site Scripting, stored and reflected. All users are impacted even root.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix GHSA-9h93-hhcx-957c

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the inventory_github record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for GHSA-9h93-hhcx-957c. A missing EPSS score is not a low risk. Compare Multiple cross-site scripting (XSS) with the linked advisory before you change production.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-116; CWE-79: Cross-site Scripting (XSS). EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

OPNsense security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 12, 2026 · Maintainer security tabs

    Detected

    ### Summary Brian Mariani from DigitalCanion SA identified at least two XSS vulnerabilities in **OPNsense 26.7.1_1.** One of them is a Stored XSS vulnerability. It allows an attacker to store malicious JavaScript code within the application. Every user who logs into the application, including users with root privileges, may be affected when the stored payload is rendered. The second vulnerability

Sources

  • Maintainer security tabsVendor advisoryGHSA-9h93-hhcx-957c

    ### Summary Brian Mariani from DigitalCanion SA identified at least two XSS vulnerabilities in **OPNsense 26.7.1_1.** One of them is a Stored XSS vulnerability. It allows an attacker to store malicious JavaScript code within the application. Every user who logs into the application, including users with root privileges, may be affected when the stored payload is rendered. The second vulnerability

    github.com

Freshness

Last verified in this catalog Aug 12, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Maintainer security tabsNov 2, 2026