CVE-2026-71490

HIGH 7.1

OPNsense: Direct comma-separated user privileges bypass OPNsense MVC read-only write protection

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-863
Vendor	opnsense
Product	core
Published	Oct 15, 2026
Last Updated	Oct 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

Low

Affected Versions

opnsense / core

< 26.1.11

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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