# CVE-2026-67281 — Mikrotik RouterOS

> As of 2026-09-05, CVE-2026-67281 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in Mikrotik RouterOS, CVSS v4.0 8.7, EPSS 0.4% (38.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-67281, most recently “Attackers Hijack MikroTik Routers Through Internet-Exposed SSH Without Authentication (MikroTrick)”.

**Last updated:** 2026-09-05

## What is CVE-2026-67281?

RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare the allocator so that the file-serving path dereferences this pointer with sufficient rights, then supply parent-directory components in an encrypted URI to escape the WebFig file namespace and disclose root-owned files, including configuration stores containing credentials.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-2026-67281 under weakness classes [CWE-824](https://cwe.mitre.org/data/definitions/824.html), [CWE-22](https://cwe.mitre.org/data/definitions/22.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:** 8.7 — High (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 38.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-05

## Is CVE-2026-67281 being exploited?

Weaponised exploit code for CVE-2026-67281 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 47 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-67281.md) (trickest)

## Affected products and versions

- **Mikrotik**: RouterOS

## How to fix CVE-2026-67281

No vendor patch reference has been recorded for CVE-2026-67281 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-2026-67281

1 tracked threat in the Threadlinqs corpus references CVE-2026-67281, 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-2026-67281
Full detection coverage and IOCs for threats exploiting CVE-2026-67281 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp