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mall4j CVE-2026-102361

| EUVDEUVD-2026-88577 CRITICAL
Missing Authentication for Critical Function (CWE-306)
2026-09-29 disclosure@vulncheck.com GHSA-97hh-9379-xqmm
9.3
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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
9.1 CRITICAL

Remote, no auth, no interaction, low complexity (single request); overwriting any account's password gives high integrity and high confidentiality (orders/PII) impact, no availability effect.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (vulncheck).

CVSS VectorVendor: vulncheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Sep 29, 2026 - 11:24 vuln.today
Metadata Corrected
Sep 29, 2026 - 00:40 vuln.today
tag: Java added
Analysis Generated
Sep 29, 2026 - 00:37 vuln.today
CVE Published
Sep 29, 2026 - 00:17 cve.org
CRITICAL 9.3

DescriptionCVE.org

mall4j through 4.0 contains a missing authentication vulnerability in the PUT /user/updatePwd endpoint that allows unauthenticated attackers to reset any storefront account password. Attackers can supply a target username in the request body to overwrite passwords without verification, enabling account takeover and access to orders and personal data.

AnalysisAI

Unauthenticated password reset in mall4j through 4.0 allows remote attackers to take over any storefront account by supplying a target username to the PUT /user/updatePwd endpoint, which lacks authentication checks (CWE-306). Publicly available exploit code exists, and the issue is rated critical (CVSS 4.0 score 9.3; independent assessment CVSS 3.1 9.1 with PR:N). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation No special conditions - remote unauthenticated exploitation against default configurations of mall4j (through version 4.0) wherever the storefront API is reachable. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine high-priority issue, not a high-CVSS-but-low-risk case. … 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 No vendor-released patch identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, immediately restrict access to the PUT /user/updatePwd endpoint by blocking it at the web application firewall or reverse proxy, disable the endpoint in mall4j configurations if possible, and audit recent logs for any unauthorized password reset attempts. …

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CVE-2026-102361 vulnerability details – vuln.today

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