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Vulnerability details

CVE-2026-89035

MikroTik RouterOS

MikroTik RouterOS 7.24.5 WebFig Session Token Replay Authentication Bypass

CVSS 4.0
9.1Critical

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.

CVSS scores

ScoreVersionSourceVector
9.1Critical 4.0 CVEProject cvelistV5 (CNA) (VulnCheck) CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
7.4High 3.1 CVEProject cvelistV5 (CNA) (VulnCheck) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

VendorProductVersionsSource
MikroTik RouterOS v ≤ 7.23.6 CVEProject cvelistV5 (CNA)
MikroTik RouterOS 7.24.0 ≤ v ≤ 7.24.5 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-10-21
Last updated
2026-10-28
State
Published
Assigner (CNA)
VulnCheck
Kolun priority
29 · Low

Exploit prediction (EPSS)

0.27%
Probability of exploitation in 30 days
19.8%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-613
    Insufficient Session Expiration