# CVE-2026-67276 — Mikrotik RouterOS > As of 2026-09-05, CVE-2026-67276 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in Mikrotik RouterOS, CVSS v4.0 9.2, EPSS 0.2% (16.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-67276, most recently “Attackers Hijack MikroTik Routers Through Internet-Exposed SSH Without Authentication (MikroTrick)”. **Last updated:** 2026-09-05 ## What is CVE-2026-67276? RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable) The record classifies CVE-2026-67276 under weakness class [CWE-347](https://cwe.mitre.org/data/definitions/347.html). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 13 days ago. ## Severity and exploitation probability - **CVSS v4.0 base score:** 9.2 — Critical (derived from score) (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`) - **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 16.1% of all scored CVEs - **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog - **Threadlinqs priority:** 7.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability - **Published:** 2026-09-05 ## Is CVE-2026-67276 being exploited? Weaponised exploit code for CVE-2026-67276 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 42 in the Threadlinqs vulnerability feed. - [dinosn/mikrotrick-poc](https://github.com/dinosn/mikrotrick-poc) (github) - [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-67276.md) (trickest) ## Affected products and versions - **Mikrotik**: RouterOS ## How to fix CVE-2026-67276 No vendor patch reference has been recorded for CVE-2026-67276 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise. ## Threat activity tracking CVE-2026-67276 1 tracked threat in the Threadlinqs corpus references CVE-2026-67276, either in the campaign’s CVE list or as an indicator on the campaign record. - [Attackers Hijack MikroTik Routers Through Internet-Exposed SSH Without Authentication (MikroTrick)](https://intel.threadlinqs.com/threat/TL-2026-2345) — CRITICAL · 2026-09-06 ## Sources Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-09-06. This product uses the NVD API but is not endorsed or certified by the NVD. **Vendor advisory and patch** - [mikrotik.com — vendor advisory](https://mikrotik.com/supportsec/september-2026-vulnerability/) - [forum.mikrotik.com — release notes](https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802) - [forum.mikrotik.com — release notes (272801)](https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801) - [forum.mikrotik.com — release notes (272800)](https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800) **Exploit and proof of concept** - [npratley.net — exploit](https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/) **Technical analysis** - [cert.pl — technical description](https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/) **Third-party advisory** - [cert.pl — third party advisory](https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve) Canonical: https://intel.threadlinqs.com/cve/CVE-2026-67276 Full detection coverage and IOCs for threats exploiting CVE-2026-67276 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp