CVE-2026-84099

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

The wpstorecart WordPress plugin through 5.0.7 does not prevent direct, unauthenticated access to a bundled add-on that deserializes user-supplied input without restricting the permitted classes, allowing unauthenticated attackers to inject arbitrary PHP objects, which may be escalated further when a suitable gadget chain is present on the site.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 12, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

IDB Ecommerce (wpStoreCart 5) <= 5.0.7 – Unauthenticated PHP Object Injection via bundled wpsc-membership-pro paypal.php | CVE 2026-84099 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/11d36ab2-ac8d-42cf-91c0-dea55d7edc9a/

Vendor Advisories for CVE-2026-84099(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 29× in last 7d / 41× 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. 2026-09-21 09:39 UTCGHSA enrichment
  2. 2026-09-20 21:40 UTCEG score recompute
  3. 2026-09-20 21:40 UTCGHSA enrichment
  4. 2026-09-20 20:16 UTCEPSS rescore
  5. 2026-09-20 09:41 UTCGHSA enrichment
  6. 2026-09-19 21:42 UTCEG score recompute
  7. 2026-09-19 21:42 UTCGHSA enrichment
  8. 2026-09-19 09:43 UTCGHSA enrichment
  9. 2026-09-18 21:17 UTCEG score recompute
  10. 2026-09-18 21:17 UTCGHSA enrichment
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-18 09:11 UTCGHSA enrichment
  13. 2026-09-17 21:12 UTCEG score recompute
  14. 2026-09-17 21:12 UTCGHSA enrichment
  15. 2026-09-17 19:32 UTCEPSS rescore
  16. 2026-09-17 09:13 UTCGHSA enrichment
  17. 2026-09-16 21:14 UTCEG score recompute
  18. 2026-09-16 21:14 UTCGHSA enrichment
  19. 2026-09-16 14:09 UTCEPSS rescore
  20. 2026-09-16 09:15 UTCEG score recompute
  21. 2026-09-16 09:15 UTCGHSA enrichment
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-15 21:16 UTCGHSA enrichment
  24. 2026-09-15 09:17 UTCEG score recompute
  25. 2026-09-15 09:17 UTCGHSA enrichment
Show 16 more
  1. 2026-09-15 03:12 UTCEPSS rescore
  2. 2026-09-15 03:12 UTCEPSS rescore
  3. 2026-09-14 21:18 UTCGHSA enrichment
  4. 2026-09-14 16:20 UTCGHSA enrichment
  5. 2026-09-14 04:21 UTCEG score recompute
  6. 2026-09-14 04:21 UTCGHSA enrichment
  7. 2026-09-13 16:22 UTCGHSA enrichment
  8. 2026-09-13 04:23 UTCEG score recompute
  9. 2026-09-13 04:23 UTCGHSA enrichment
  10. 2026-09-12 16:23 UTCGHSA enrichment
  11. 2026-09-12 15:44 UTCEG score recompute▲ 8.10
  12. 2026-09-12 15:44 UTCGHSA enrichment
  13. 2026-09-12 15:43 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  14. 2026-09-12 06:20 UTCNVD update
  15. 2026-09-12 06:14 UTCEG score recompute
  16. 2026-09-12 06:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84099?
CVE-2026-84099 is a high vulnerability published on September 12, 2026. The wpstorecart WordPress plugin through 5.0.7 does not prevent direct, unauthenticated access to a bundled add-on that deserializes user-supplied input without restricting the permitted classes, allowing unauthenticated attackers to inject arbitrary PHP objects, which may be escalated further when…
When was CVE-2026-84099 disclosed?
CVE-2026-84099 was first published in the National Vulnerability Database on September 12, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84099 actively exploited?
CVE-2026-84099 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 80.9% of all scored CVEs.
What is the CVSS score of CVE-2026-84099?
CVE-2026-84099 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-84099?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84099, 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

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