CVE-2026-89035

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.

CVSS v3 7.4 HIGH

7.4^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://www.vulncheck.com/advisories/mikrotik-routeros-webfig-session-token-replay-authentication-bypass

Configurations

No configuration.

History

21 Oct 2026, 18:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-21 18:17

Updated : 2026-10-28 02:17

NVD link : CVE-2026-89035

Mitre link : CVE-2026-89035

CVE.ORG link : CVE-2026-89035

JSON object : View

Products Affected

No product.

CWE

CWE-613

Insufficient Session Expiration

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