Vulnerability · Published Oct 15, 2026 · Assigned by GitHub_M

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

High 7.1

In plain English

A high-severity incorrect authorization in core from opnsense. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.4%top 67.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
opnsense	core	< 26.1.11

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References

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