---
id: CVE-2026-89035
title: MikroTik RouterOS 7.24.5 WebFig Session Token Replay Authentication Bypass
summary: >-
  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
  funct…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-613
vendor: MikroTik
product: RouterOS
affected:
  - RouterOS <= 7.23.6
  - RouterOS >= 7.24.0 <= 7.24.5
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T17:16:40.843Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89035'
references:
  - url: >-
      https://www.vulncheck.com/advisories/mikrotik-routeros-webfig-session-token-replay-authentication-bypass
    label: >-
      VulnCheck Advisory: MikroTik RouterOS 7.24.5 WebFig Session Token Replay
      Authentication Bypass
tags:
  - cve.org
ingestedAt: '2026-10-21T18:09:27.283Z'
---

## Overview

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.

## Affected

- `RouterOS <= 7.23.6`
- `RouterOS >= 7.24.0 <= 7.24.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.