CVE-2026-82191

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

Powerful and intuitive Joomla eCommerce. - J2Commerce

https://www.j2commerce.com/

Vendor Advisories for CVE-2026-82191(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 11× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 18:35 UTCEG score recompute
  3. 2026-09-18 18:35 UTCGHSA enrichment
  4. 2026-09-17 19:18 UTCGHSA enrichment
  5. 2026-09-16 19:33 UTCEG score recompute
  6. 2026-09-16 19:33 UTCGHSA enrichment
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-15 20:41 UTCEG score recompute
  9. 2026-09-15 19:32 UTCEG score recompute
  10. 2026-09-15 19:00 UTCEG score recompute
  11. 2026-09-15 18:57 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82191?
CVE-2026-82191 is a medium vulnerability published on September 15, 2026. 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…
When was CVE-2026-82191 disclosed?
CVE-2026-82191 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82191 actively exploited?
CVE-2026-82191 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.4% of all scored CVEs.
What is the CVSS score of CVE-2026-82191?
CVE-2026-82191 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-82191?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82191, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-82191

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