CVE-2026-89035 MikroTik RouterOS 7.24.5 WebFig Session Token Replay Authentication Bypass
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-89035?
CVE-2026-89035 is a critical vulnerability in MikroTik RouterOS, published on 21 Oct 2026.
Official description
MikroTik RouterOS through 7.24.5 contains a session token replay vulnerability in the WebFig interface that allows attackers to bypass authentication by replaying captured session tokens across new ECDH sessions. The makeSessionKey function in libucrypto.so generates tokens using fixed salts without incorporating channel-specific or session-specific input, and the user service validates tokens against the login store without verifying channel context, enabling stolen tokens to grant persistent administrative access until the token store is explicitly cleared. This vulnerability extends the impact of CVE-2025-61481, which identified the underlying transport-layer exposure without a corresponding fix.
Weakness: CWE-613
Which versions are affected by CVE-2026-89035?
How do I fix CVE-2026-89035?
No fix has been published for CVE-2026-89035 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-89035 being exploited?
There is no known exploitation of CVE-2026-89035 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-j7mx-6943-qw55.