Read the docs
TI-2026-78890 Aliases CVE-2026-89035GHSA-j7mx-6943-qw55

Session token replay bypasses authentication in MikroTik WebFig

Priority MEDIUM 41CWE-613Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-613.

Summary

MikroTik RouterOS from 0 through 7.23.6 and from 7.24.0 through 7.24.5 has a session token replay flaw in the WebFig interface. The makeSessionKey function in libucrypto.so generates tokens with fixed salts and the user service does not check channel context, so captured tokens can be replayed in new ECDH sessions (CWE-613). A remote attacker who captures a session token can bypass authentication and keep administrative access until the token store is explicitly cleared.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00274 19th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MikroTikRouterOSup to 7.23.6; 7.24.0 – 7.24.5—No fix listedCNA
  • RouterOS VendorMikroTik Affected up to 7.23.6; 7.24.0 – 7.24.5 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*——MikroTik
  • cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:* Versions — — ·MikroTik

Remediation

The sources list no fixed version for MikroTik RouterOS.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-89035
  2. 2026-10-21 Alias added: GHSA-j7mx-6943-qw55
  3. 2026-10-23 Priority changed: MEDIUM → LOW
  4. 2026-10-28 CISA SSVC decision points changed
  5. 2026-10-28 Priority changed: LOW → MEDIUM

References

—

  • TI-2018-05369 A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-58872 SSH session privilege manipulation via a crafted username in Mikrotik RouterOS KEVCVSS 4.0CRITICAL 9.2
  • TI-2018-10669 MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary… KEVCVSS 3.1CRITICAL 9.1
  • TI-2026-47574 Kernel memory disclosure and denial of service in MikroTik RouterOS btest service KEVCVSS 4.0HIGH 8.8
  • TI-2026-47576 SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS KEVCVSS 4.0MEDIUM 6.9
  • TI-2022-22302 Out-of-bounds read in MicroTik RouterOS CVSS 3.1CRITICAL 9.8
See all 108 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences