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    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-103903",
        "assignerOrgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
        "state": "PUBLISHED",
        "assignerShortName": "ENISA",
        "dateReserved": "2026-10-01T14:12:50.876Z",
        "datePublished": "2026-10-12T10:37:23.578Z",
        "dateUpdated": "2026-10-12T10:37:23.578Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
                "shortName": "ENISA",
                "dateUpdated": "2026-10-12T10:37:23.578Z"
            },
            "title": "MikroTik RouterOS WinBox split-principal authentication bypass allows privilege escalation",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-863",
                            "description": "CWE-863 Incorrect Authorization",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "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"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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's account, while the\nindependently supplied stage-two username is used to install the target\naccount's 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's password and can use that session to increase the privileges\nof the attacker's own account.",
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                            "value": "<span>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's account, while the\nindependently supplied stage-two username is used to install the target\naccount's 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's password and can use that session to increase the privileges\nof the attacker's own account.</span>"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://mikrotik.com/download/changelogs?channelFilter=stable&versionFilter=7.24.5",
                    "name": "MikroTik RouterOS 7.24.5 stable release notes",
                    "tags": [
                        "release-notes"
                    ]
                },
                {
                    "url": "https://forum.mikrotik.com/t/7-25rc1-testing-is-released/27352",
                    "tags": [
                        "release-notes"
                    ]
                },
                {
                    "url": "https://br2sec.com/lv/resursi/2026-routeros-winbox-auth-bypass/",
                    "tags": [
                        "technical-description",
                        "third-party-advisory"
                    ]
                },
                {
                    "url": "https://cvd.cert.lv/disclosed/vuln-all-709639748",
                    "tags": [
                        "government-resource"
                    ]
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subAvailabilityImpact": "NONE",
                        "exploitMaturity": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
                        "version": "4.0",
                        "baseSeverity": "HIGH",
                        "baseScore": 8.7,
                        "vectorString": "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"
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                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "availabilityImpact": "HIGH",
                        "baseSeverity": "HIGH",
                        "baseScore": 8.8,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
                    }
                }
            ],
            "workarounds": [
                {
                    "lang": "en",
                    "value": "Until upgrade, restrict the WinBox service to trusted\nmanagement addresses, remove the winbox policy from low-privilege accounts, or\ndisable WinBox. These measures reduce reachability but do not replace the fix.",
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                            "value": "<span>Until upgrade, restrict the WinBox service to trusted\nmanagement addresses, remove the winbox policy from low-privilege accounts, or\ndisable WinBox. These measures reduce reachability but do not replace the fix.</span>"
                        }
                    ]
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "Upgrade to RouterOS 7.24.5 stable, 7.25rc1 testing, or\na later vendor release containing the fix.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<span>Upgrade to RouterOS 7.24.5 stable, 7.25rc1 testing, or\na later vendor release containing the fix.</span>"
                        }
                    ]
                }
            ],
            "x_generator": {
                "engine": "Vulnogram 1.0.5"
            },
            "source": {
                "discovery": "UNKNOWN"
            }
        }
    }
}