CVE-2026-30868Public exploitNetwork attack vector

Unauthorized state changes via unprotected GET endpoints

Published Mar 11, 2026 · Updated Mar 11, 2026

Cross-site request forgery in OPNsense core before 26.1.4 allows remote attackers to trigger privileged backend state changes. ApiControllerBase validates CSRF tokens only for POST, PUT, and DELETE, while MVC routes state-changing controller actions invoked through GET to configd. Exploitation requires an authenticated user to follow a cross-site top-level link or redirect, after which service reloads and configuration changes execute.

CVSS severity6.3
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in OPNsense core before 26.1.4 allows remote attackers to trigger privileged backend state changes. ApiControllerBase validates CSRF tokens only for POST, PUT, and DELETE, while MVC routes state-changing controller actions invoked through GET to configd. Exploitation requires an authenticated user to follow a cross-site top-level link or redirect, after which service reloads and configuration changes execute.

The record

CVE
CVE-2026-30868
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Deciso B.V.
Product
core
Classifications
CWE-352
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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=< 26.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Deciso B.V. · coreversion=< 26.1.4

Published CVSS scores

6.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

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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Your stack

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