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CVE-2026-89035— MikroTik RouterOS 7.24.5 WebFig Session Token Replay Authentication Bypass

Quick assessment

Affected
MikroTik RouterOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MikroTik RouterOS 7.24.5 及更早版本在 WebFig 接口中存在会话令牌重放漏洞。攻击者可通过在新 ECDH（椭圆曲线 Diffie-Hellman）会话中重放截获的会话令牌，从而绕过身份验证。该漏洞的根源在于 libucrypto.so 中的 makeSessionKey 函数：该函数使用固定盐值生成令牌，未纳入与通信通道或会话相关的输入；同时，用户服务在验证令牌时仅对照登录存储，未校验通道上下文。因此，被盗用的令牌可长期授予管理员权限，直至令牌存储被显式清除。此漏洞扩大了 CVE-202

CVSS 7.4 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
MikroTik RouterOS ≤ 7.23.6 affected
7.24.0≤ 7.24.5 affected
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I. Basic Information for CVE-2026-89035

Vulnerability Information
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Vulnerability Title
MikroTik RouterOS 7.24.5 WebFig Session Token Replay Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的会话过期机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MikroTik RouterOS 0 ~ 7.23.6 -

II. Public POCs for CVE-2026-89035

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III. Intelligence Information for CVE-2026-89035

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Vendor Advisories for CVE-2026-89035 (1)

IV. Related Vulnerabilities

Same product: RouterOS
Same vendor: MikroTik
Same weakness: CWE-613

V. Comments for CVE-2026-89035

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