What is the CVSS score of CVE-2026-82189?

CVE-2026-82189 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.3%.

J2Store Extension For Joomla CVE-2026-82189

EUVD-2026-79286 HIGH

External Control of Assumed-Immutable Web Parameter (CWE-472)

2026-09-15 Joomla

GHSA-739c-vch3-5f25

Information Disclosure J2Store Extension For Joomla J2Commerce Com

8.7

CVSS 4.0 · Vendor: Joomla

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Vulnerability Assessment

Weakness

CWE

CWE-472

OWASP Top 10:2025

A06:2025 - Insecure Design

ASVS 5.0

V3 - Web Frontend Security Server-side parameter enforcement

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

Unauthenticated order-state tampering in the J2Store e-commerce extension for Joomla (versions 1.0.0–3.3.2, 4.0.0–4.0.22, and 4.1.0–4.1.7) lets anyone mark any order as FAILED without supplying a payment amount, transaction ID, or any other verification data. An attacker can mass-fail pending orders to disrupt revenue, or flip already-fulfilled orders back to FAILED, triggering unwarranted refunds, cancellations, and customer-support load. The CVE carries a CVSS 4.0 score of 8.7 driven entirely by high integrity impact; no public exploit code has been identified and the issue is not listed in CISA KEV at time of analysis.

Affected VersionsENISA

J2Store extension for Joomla 1.0.0-3.3.22

J2Store extension for Joomla 4.1.0-4.1.7

J2Store extension for Joomla 4.0.0-4.0.22

Affected Packages

euvd j2store_extension_for_joomla no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (Joomla) PRIMARY 8.7 HIGH

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

Primary rating from Vendor (Joomla) · only source for this CVE.

CVSS VectorVendor: Joomla

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

None

Vulnerable system: Integrity

High

Vulnerable system: Availability

None

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

Joomla Extension - j2commerce.com - Any order can be marked Failed by anyone in J2Store 1.0.0-3.3.2, 4.0.0-4.0.22, 4.1.0-4.1.7 - Unauthenticated denial-of-service against the order pipeline: mass-failing pending orders to disrupt revenue and force manual reprocessing, or flipping already-fulfilled orders back to FAILED to cause operational confusion (unwarranted refunds/cancellations, customer-support load). Unlike the earlier confirmation-fraud issue, this required no correct payment amount or transaction data at all.

Threat Intelligence Overview

EPSS Score

0.3%

Top 83% exploitable

Data Quality

4 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.3%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.