Vulnerability · Published Oct 21, 2026 · Assigned by VulnCheck

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

High 7.4

In plain English

A high-severity security flaw in RouterOS from MikroTik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.3%top 80.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
MikroTik	RouterOS	0 – through 7.23.67.24.0 – through 7.24.5

Weakness: CWE-613 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

VulnCheck Advisory: MikroTik RouterOS 7.24.5 WebFig Session Token Replay Authentication Bypass third-party-advisory