Mikrotik released a patch late last week for an already-exploited vulnerability. The vulnerability allows an SSH authentication bypass and is already being exploited. At this point, assume compromise. Attackers have been adding new accounts to affected devices to maintain access after a patch is installed.
The patch will attempt to detect compromise and set the “Flagged” status.
Details:
https://mikrotik.com/supportsec/september-2026-vulnerability
—
Johannes B. Ullrich, Ph.D. , Dean of Research, SANS.edu
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