GHSA-23WM-V672-9CVC
Vulnerability from github – Published: 2026-10-12 12:30 – Updated: 2026-10-12 12:30An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik RouterOS allows a remote authenticated attacker with credentials for a low-privilege account permitted to use WinBox to obtain the authorization policy of a different existing account. The stage-one EC-SRP challenge and proof are verified using the attacker's account, while the independently supplied stage-two username is used to install the target account's privileges. By specifying a higher-privilege account such as admin, a low-privilege user can obtain a full administrative session without knowing the target account's password and can use that session to increase the privileges of the attacker's own account.
{
"affected": [],
"aliases": [
"CVE-2026-103903"
],
"database_specific": {
"cwe_ids": [
"CWE-863"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-12T11:17:09Z",
"severity": "HIGH"
},
"details": "An incorrect authorization vulnerability in the WinBox\nauthentication flow of MikroTik RouterOS allows a remote authenticated attacker\nwith credentials for a low-privilege account permitted to use WinBox to obtain\nthe authorization policy of a different existing account. The stage-one EC-SRP\nchallenge and proof are verified using the attacker\u0027s account, while the\nindependently supplied stage-two username is used to install the target\naccount\u0027s privileges. By specifying a higher-privilege account such as admin, a\nlow-privilege user can obtain a full administrative session without knowing the\ntarget account\u0027s password and can use that session to increase the privileges\nof the attacker\u0027s own account.",
"id": "GHSA-23wm-v672-9cvc",
"modified": "2026-10-12T12:30:27Z",
"published": "2026-10-12T12:30:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103903"
},
{
"type": "WEB",
"url": "https://br2sec.com/lv/resursi/2026-routeros-winbox-auth-bypass"
},
{
"type": "WEB",
"url": "https://cvd.cert.lv/disclosed/vuln-all-709639748"
},
{
"type": "WEB",
"url": "https://forum.mikrotik.com/t/7-25rc1-testing-is-released/27352"
},
{
"type": "WEB",
"url": "https://mikrotik.com/download/changelogs?channelFilter=stable\u0026versionFilter=7.24.5"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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:X",
"type": "CVSS_V4"
}
]
}
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|---|
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