What is the CVSS score of CVE-2026-82191?

CVE-2026-82191 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.3%.

J2Store Extension For Joomla CVE-2026-82191

EUVD-2026-79290 MEDIUM

Use of Predictable Algorithm in Random Number Generator (CWE-1241)

2026-09-15 Joomla

GHSA-hv62-7458-mg3v

Code Injection J2Store Extension For Joomla J2Commerce Com

5.3

CVSS 4.0 · Vendor: Joomla

View

Vulnerability Assessment

Weakness

CWE

CWE-1241

OWASP Top 10:2025

A04:2025 - Cryptographic Failures

ASVS 5.0

V11 - Cryptography Verified random number generation

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

Parameter smuggling into the PayPal notify redirect of the J2Store extension for Joomla (versions 1.0.0-3.3.2, 4.0.0-4.0.22, and 4.1.0-4.1.7) lets an attacker-chosen query string ride along with the redirect that the notify endpoint issues to com_j2store's checkout controller, instead of the intended fixed parameter set. A victim must load the crafted link (UI:P in the CVSS 4.0 vector), after which the follow-up request to the checkout controller is processed with the injected view/task/paction parameters, giving a limited integrity impact (VI:L) with no confidentiality or availability loss. The vendor's own description concedes this does not grant an unauthenticated attacker anything they could not obtain by calling the same com_j2store URL directly; no public exploit code and no CISA KEV listing were identified in the supplied intelligence.

Affected VersionsENISA

J2Store extension for Joomla 4.1.0-4.1.7

J2Store extension for Joomla 4.0.0-4.0.22

J2Store extension for Joomla 1.0.0-3.3.22

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 5.3 MEDIUM

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

Passive

Vulnerable system: Confidentiality

None

Vulnerable system: Integrity

Low

Vulnerable system: Availability

None

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

Joomla Extension - j2commerce.com - Unescaped request data reflected into PayPal notify redirect in J2Store 1.0.0-3.3.2, 4.0.0-4.0.22, 4.1.0-4.1.7 - A crafted link to the paypal notify endpoint, if followed by a victim's browser (or an automated system that fetches it), causes the resulting redirect to com_j2store's checkout controller to carry attacker-chosen query parameters instead of only the intended view=checkout&task=confirmPayment&orderpayment_type=...&paction=process set - parameter injection/smuggling into that follow-up request. This requires a victim to load the crafted link (UI:R/UI:P); it does not by itself grant an unauthenticated attacker anything they could not already obtain by requesting the target com_j2store URL directly with their own parameters.

Threat Intelligence Overview

EPSS Score

0.3%

Top 82% 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 MEDIUM

CISA KEV No

Public POC No

EPSS 0.3%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +26

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.