Vulnerability · Published Sep 5, 2026 · Assigned by CERT-PL

CVE-2026-67281Unauthenticated file read in Mikrotik RouterOS

High 8.7

In plain English

A high-severity path traversal in RouterOS from Mikrotik. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.7%top 45.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official description

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 affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)

Affected products (as reported)

Vendor	Product	Versions
Mikrotik	RouterOS	7.24 – before 7.24.27.20 – before 7.23.4

Weakness: CWE-824, CWE-22 · Vector: 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

References

https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve third-party-advisory
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ technical-description
https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ exploit
https://mikrotik.com/supportsec/september-2026-vulnerability/ vendor-advisory
https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 release-notes
https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800 release-notes