CVE-2026-89035

highpriority · track · 40EPSS 0.003 · 20 %ileexploit · PoC

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.27% (20th) EPSS

CVSS 7.4 · high

Is it mine?

0 products

Check your exposure

Who says so?

— sources

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

9.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.9–9.1

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nprimary · disclosure@vulncheck.comexploitability 2.2 · impact 5.2

v4.09.1criticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · disclosure@vulncheck.com

v4.06.9mediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-613USprimaryCWE-613US

exploits (1)

Public proof-of-concept and weaponised exploit code.

emirwtz/CVE-2026-89035Offline Python detector for CVE-2026-89035 exposure in MikroTik RouterOS inventories, with CSV/JSON input and auditable reports.PoC · poc_in_github

affected products

Products and version ranges known to be affected.

No affected products recorded.

sources

Which sources assert this record, and when.

NVD CVE.org MITRE

published 2026-10-21modified 2026-10-22

related (733)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2014-2595US	critical9.8	16.9% (97th)	Exploit	2020-02-12
Barracuda Web Application Firewall (WAF) 7.8.1.013 allows remote attackers to bypass authentication by leveraging a permanent authentication token obtained from a query string.
CVE-2020-27422US	critical9.8	7.86% (95th)	Exploit	2020-11-16
In Anuko Time Tracker v1.19.23.5311, the password reset link emailed to the user doesn't expire once used, allowing an attacker to use the same link to takeover the account.
CVE-2021-24019US	critical9.8	3.90% (90th)	Exploit	2021-10-06
An insufficient session expiration vulnerability [CWE- 613] in FortiClientEMS versions 6.4.2 and below, 6.2.8 and below may allow an attacker to reuse the unexpired admin user sess…
CVE-2020-29667US	critical9.8	3.23% (88th)	Exploit	2020-12-10
In Lan ATMService M3 ATM Monitoring System 6.1.0, a remote attacker able to use a default cookie value, such as PHPSESSID=LANIT-IMANAGER, can achieve control over the system becaus…
CVE-2017-6529US	high8.8	2.90% (87th)	Exploit	2017-03-09
An issue was discovered in dnaTools dnaLIMS 4-2015s13. dnaLIMS is vulnerable to session hijacking by guessing the UID parameter.

+728 more

references (1) nvd

External citations — patches, advisories, analysis.

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

scry

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