Vulnerability Details 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 affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)
Exploit prediction scoring system (EPSS) score
EPSS Score 0.007
EPSS Ranking 52.2%
CVSS Severity
CVSS v3 Score 7.5
References
- https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
- https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
- https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
- https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800
- https://mikrotik.com/supportsec/september-2026-vulnerability/
- https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/
Products affected by CVE-2026-67281
-
cpe:2.3:o:mikrotik:routeros:7.20
-
cpe:2.3:o:mikrotik:routeros:7.20.1
-
cpe:2.3:o:mikrotik:routeros:7.20.2
-
cpe:2.3:o:mikrotik:routeros:7.20.3
-
cpe:2.3:o:mikrotik:routeros:7.20.4
-
cpe:2.3:o:mikrotik:routeros:7.20.5
-
cpe:2.3:o:mikrotik:routeros:7.20.6
-
cpe:2.3:o:mikrotik:routeros:7.20.7
-
cpe:2.3:o:mikrotik:routeros:7.20.8
-
cpe:2.3:o:mikrotik:routeros:7.21
-
cpe:2.3:o:mikrotik:routeros:7.21.1
-
cpe:2.3:o:mikrotik:routeros:7.21.2
-
cpe:2.3:o:mikrotik:routeros:7.21.3
-
cpe:2.3:o:mikrotik:routeros:7.21.4
-
cpe:2.3:o:mikrotik:routeros:7.21.5
-
cpe:2.3:o:mikrotik:routeros:7.22
-
cpe:2.3:o:mikrotik:routeros:7.22.1
-
cpe:2.3:o:mikrotik:routeros:7.22.2
-
cpe:2.3:o:mikrotik:routeros:7.22.3
-
cpe:2.3:o:mikrotik:routeros:7.23
-
cpe:2.3:o:mikrotik:routeros:7.23.1
-
cpe:2.3:o:mikrotik:routeros:7.23.2
-
cpe:2.3:o:mikrotik:routeros:7.23.3
-
cpe:2.3:o:mikrotik:routeros:7.24
-
cpe:2.3:o:mikrotik:routeros:7.24.1