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CVE-2026-103903 MikroTik RouterOS WinBox split-principal authentication bypass allows privilege escalation

🗓️ 12 Oct 2026 10:37:23Reported by ENISAType 
cvelist
 cvelist
🔗 www.cve.org👁 136 Views

Remote authenticated privilege escalation in MikroTik RouterOS WinBox via auth bypass.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-103903
12 Oct 202621:22
–circl
cnnvd
CNNVD
MikroTik RouterOS Authorization Issues Vulnerability
11 Oct 202616:00
–cnnvd
cve
CVE
CVE-2026-103903
12 Oct 202610:37
–cve
euvd
EUVD
EUVD-2026-97325
12 Oct 202610:37
–euvd
nvd
NVD
CVE-2026-103903
12 Oct 202611:17
–nvd
ptsecurity
Positive Technologies
PT-2026-110529
12 Oct 202600:00
–ptsecurity
rapid7
Rapid7 Vulnerability Database (full)
CVE-2026-103903: Incorrect Authorization
12 Oct 202600:00
–rapid7
vulnrichment
Vulnrichment
CVE-2026-103903 MikroTik RouterOS WinBox split-principal authentication bypass allows privilege escalation
12 Oct 202610:37
–vulnrichment
[
  {
    "vendor": "MikroTik",
    "product": "RouterOS",
    "modules": [
      "WinBox authentication / user service"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "7.0.0",
        "lessThan": "7.24.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "7.25rc1",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "affected"
  }
]

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12 Oct 2026 10:37Current
CVSS 48.7
CVSS 3.18.8
EPSS0.00415
SSVC
136