CVE-2026-86101

An improper authorization vulnerability in WatchGuard Fireware OS's SAML login process allows a remote, authenticated SAML user with access only to the Access Portal to obtain unauthorized Mobile VPN with SSL access through a specially crafted request.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://psirt.watchguard.com/CVE-2026-86101	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:watchguard:fireware::::::::
	cpe:2.3:o:watchguard:fireware::::::::
	cpe:2.3:o:watchguard:fireware::::::::
	cpe:2.3:o:watchguard:fireware::::::::

History

08 Oct 2026, 19:40

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.5
CPE		cpe:2.3:o:watchguard:fireware::::::::
References	~~() https://psirt.watchguard.com/CVE-2026-86101 -~~	() https://psirt.watchguard.com/CVE-2026-86101 - Patch, Vendor Advisory
First Time		Watchguard Watchguard fireware

30 Sep 2026, 00:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-30 00:16

Updated : 2026-10-08 19:40

NVD link : CVE-2026-86101

Mitre link : CVE-2026-86101

CVE.ORG link : CVE-2026-86101

JSON object : View

Products Affected

watchguard

fireware

CWE

CWE-285

Improper Authorization

CWE-863

Incorrect Authorization

{"id": "CVE-2026-86101", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-86101", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-30T14:22:36.042789Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.2, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:H/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "affectedData": [{"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "2026.3", "lessThan": "2026.3.2", "versionType": "custom"}, {"status": "affected", "version": "2025.0", "lessThan": "2026.2.3", "versionType": "custom"}, {"status": "affected", "version": "12.0", "lessThan": "12.12.3", "versionType": "custom"}], "platforms": ["Default"], "defaultStatus": "unaffected"}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "lessThan": "12.5.21", "versionType": "custom"}], "platforms": ["T15/T35"], "defaultStatus": "unaffected"}]}], "published": "2026-09-30T00:16:36.283", "references": [{"url": "https://psirt.watchguard.com/CVE-2026-86101", "tags": ["Patch", "Vendor Advisory"], "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "description": [{"lang": "en", "value": "CWE-285"}, {"lang": "en", "value": "CWE-863"}]}], "descriptions": [{"lang": "en", "value": "An improper authorization vulnerability in WatchGuard Fireware OS's SAML login process allows a remote, authenticated SAML user with access only to the Access Portal to obtain unauthorized Mobile VPN with SSL access through a specially crafted request."}], "lastModified": "2026-10-08T19:40:03.017", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C618D05C-B8A0-4912-B87E-B67A0686C14D", "versionEndExcluding": "12.5.21", "versionStartIncluding": "12.0"}, {"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "684B81A6-0CE5-4424-A38A-FE989C790E7F", "versionEndExcluding": "12.12.3", "versionStartIncluding": "12.12"}, {"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9F11812A-FDA8-401D-871B-219DFDADEDC8", "versionEndExcluding": "2026.2.3", "versionStartIncluding": "2025.0"}, {"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "525833A2-ABEC-4C06-BE1B-6A5E64A21775", "versionEndExcluding": "2026.3.2", "versionStartIncluding": "2026.3"}], "operator": "OR"}]}], "sourceIdentifier": "5d1c2695-1a31-4499-88ae-e847036fd7e3"}