CVE-2026-67279: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-pqp3-gjgf-83cf
Share
CVSS 6.5
CWE-841
Published
Advisory Summary

CVE-2026-67279 is a MODERATE (CVSS 6.5) security vulnerability vulnerability (CWE-841: Improper Enforcement of Behavioral Workflow) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-67279 at a Glance

CVE Identifier CVE-2026-67279
GHSA Identifier GHSA-pqp3-gjgf-83cf
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-841: Improper Enforcement of Behavioral Workflow
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-67279

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-67279, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-841: Improper Enforcement of Behavioral Workflow, where the product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

References

NVD — CVE-2026-67279 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67279
bishopfox.com/blog/mikrotrick-ins... WEB
https://bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain
cert.pl/en/posts/2026/09/mi... WEB
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
cert.pl/en/posts/2026/09/vu... WEB
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited
forum.mikrotik.com/t/6-49-21-long-term... WEB
https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802
forum.mikrotik.com/t/7-23-4-long-term-... WEB
https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
forum.mikrotik.com/t/7-24-2-stable-is-... WEB
https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800
mikrotik.com/supportsec/septembe... WEB
https://mikrotik.com/supportsec/september-2026-vulnerability
npratley.net/reversing-mikrotiks... WEB
https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain
www.cisa.gov/known-exploited-vul... WEB
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67279

Frequently Asked Questions

What is CVE-2026-67279?
CVE-2026-67279 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-841: Improper Enforcement of Behavioral Workflow.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-67279?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-67279?
CVE-2026-67279 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-67279?
CVE-2026-67279 is classified under CWE-841: Improper Enforcement of Behavioral Workflow (The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.).
How can I check Maven dependencies for CVE-2026-67279?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-pqp3-gjgf-83cf",
  "modified" : "2026-09-25T18:31:17Z",
  "published" : "2026-09-05T21:31:20Z",
  "aliases" : [ "CVE-2026-67279" ],
  "details" : "RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-67279"
  }, {
    "type" : "WEB",
    "url" : "https://bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain"
  }, {
    "type" : "WEB",
    "url" : "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
  }, {
    "type" : "WEB",
    "url" : "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited"
  }, {
    "type" : "WEB",
    "url" : "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
  }, {
    "type" : "WEB",
    "url" : "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
  }, {
    "type" : "WEB",
    "url" : "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
  }, {
    "type" : "WEB",
    "url" : "https://mikrotik.com/supportsec/september-2026-vulnerability"
  }, {
    "type" : "WEB",
    "url" : "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain"
  }, {
    "type" : "WEB",
    "url" : "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67279"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-841" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-05T20:17:18Z"
  }
}