CVE-2026-71490Public exploitNetwork attack vector

Read-only bypass via unsplit direct-user privileges

Published Oct 15, 2026 · Updated Oct 15, 2026

OPNsense Core before 26.1.11 allows remote authenticated users to bypass MVC read-only restrictions and write component configuration. ACL::hasPrivilege() retains comma-separated direct privileges as one string, so its exact comparison misses user-config-readonly and throwReadOnly() permits writes. The 26.4 branch through 26.4.1 is also affected; exploitation requires a component write privilege and user-config-readonly stored together in one direct privilege value, with changes limited to the assigned component.

CVSS severity7.1
High
EPSS probability0.38%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OPNsense Core before 26.1.11 allows remote authenticated users to bypass MVC read-only restrictions and write component configuration. ACL::hasPrivilege() retains comma-separated direct privileges as one string, so its exact comparison misses user-config-readonly and throwReadOnly() permits writes. The 26.4 branch through 26.4.1 is also affected; exploitation requires a component write privilege and user-config-readonly stored together in one direct privilege value, with changes limited to the assigned component.

The record

CVE
CVE-2026-71490
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
OPNsense
Product
OPNsense Core
Classifications
CWE-863, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 26.1.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OPNsense · OPNsense Coreversion=< 26.1.11

Published CVSS scores

7.1GitHub_MCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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