CVE-2026-67281

Unauthenticated file read in Mikrotik RouterOS

State: Published
Severity: 8.7 High
Published: Sep 5, 2026
Updated: Sep 8, 2026
Reserved: Jul 29, 2026

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)

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	CERT-PL

Weaknesses

CWE-824 Access of uninitialized pointer
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
RouterOSMikrotik	7.24 to before 7.24.2Affected 7.20 to before 7.23.4Affected

References

https://cert.pl/en/posts/2026/09/mikrotik-routeros-cvethird-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/272801release-notes
https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800release-notes

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