Which versions of ShizenBox2 are affected by EUVD-2026-70366?

ShizenBox2 edge-app versions 3.1.15 and earlier contain an authorization bypass enabling any authenticated user to change other users' passwords, creating a direct account takeover pathway.

How to fix or mitigate EUVD-2026-70366?

Within 24 hours, audit ShizenBox2 password-change logs for unauthorized modifications and notify all users to verify account integrity; reset credentials for any compromised accounts discovered. Within 7 days, implement mandatory multi-factor authentication on all ShizenBox2 user accounts, contact the vendor to confirm patch status and expected delivery timeline, and complete an inventory of systems and applications relying on ShizenBox2 for authentication. Within 30 days, apply any released vendor patches immediately to production; if no patch is available, execute a formal risk review and deploy compensating controls-either restrict ShizenBox2 access to administrators only via network firewall, or develop and execute a migration plan to an alternative edge-app solution.

ShizenBox2 EUVD-2026-70366

Q: What is the CVSS score of EUVD-2026-70366?

EUVD-2026-70366 has a CVSS 4.0 base score of 7.1 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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:X. EPSS exploitation probability: 0.4%.

| CVE-2026-80254 HIGH

Authorization Bypass Through User-Controlled Key (CWE-639)

2026-09-03 jpcert

GHSA-hc97-2jfm-wf2q

Shizenbox2 Edge App

7.1

CVSS 4.0 · Vendor: jpcert

Severity by source

Vendor (jpcert) PRIMARY

7.1 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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:X

vuln.today AI

6.5 MEDIUM

Network-accessible IDOR requiring only a low-privilege session; integrity-only impact (password overwrite), no confidentiality or availability effect, unchanged scope.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (jpcert).

CVSS VectorVendor: jpcert

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Analysis Updated

Sep 03, 2026 - 13:18 vuln.today

v2 (cvss_changed)

Re-analysis Queued

Sep 03, 2026 - 13:07 vuln.today

cvss_changed

Severity Changed

Sep 03, 2026 - 13:07 NVD

MEDIUM HIGH

CVSS changed

Sep 03, 2026 - 13:07 NVD

6.5 (MEDIUM) 7.1 (HIGH)

Metadata Corrected

Sep 03, 2026 - 09:40 vuln.today

tag: Authentication Bypass removed

Analysis Generated

Sep 03, 2026 - 09:22 vuln.today

DescriptionCVE.org

Authorization bypass through user-controlled key issue exists in ShizenBox2 (edge-app). If exploited, an attacker who can log in to the product may change the other user's password.

AnalysisAI

Authorization bypass in ShizenBox2 edge-app (versions ≤ v3.1.15) permits any authenticated low-privilege user to change another account's password by supplying a manipulated user-controlled key in the password-change request - a classic Insecure Direct Object Reference (IDOR) pattern classified under CWE-639. The CVSS 4.0 vector (PR:L/VI:H) confirms that exploitation requires only a valid login with no elevated permissions or user interaction, yielding a high integrity impact against targeted accounts. …

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Vulnerability AssessmentAI

Exploitation	Exploitation requires an active authenticated session with at least low-privilege access to the ShizenBox2 edge-app; unauthenticated attackers cannot exploit this flaw. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 4.0 score of 7.1 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H) accurately reflects the real-world threat: low-complexity network exploitation requiring only a valid authenticated session, with high integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation	Update ShizenBox2 (edge-app) to a version beyond v3.1.15 as directed by the vendor advisory published via JVN (https://jvn.jp/en/jp/JVN91715694/) and the vendor PDF (https://www.se-digital.net/wp-content/uploads/2026/08/CVE-2026-80254.pdf). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, audit ShizenBox2 password-change logs for unauthorized modifications and notify all users to verify account integrity; reset credentials for any compromised accounts discovered. …

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