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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mikrotik RouterOS
Default version status: unaffected
7.24 to < 7.24.2affected7.20 to < 7.23.4affected
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://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ ↗
- https://mikrotik.com/supportsec/september-2026-vulnerability/ ↗
- 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 ↗