CVE-2026-83533

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-02. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 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.

The WP Express Checkout WordPress plugin before 2.4.9 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

WP Express Checkout < 2.4.9 – Unauthenticated Payment Bypass via wpec_process_payment | CVE 2026-83533 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/8ffb76d6-fda5-4819-ab07-d8c086169110/

Vendor Advisories for CVE-2026-83533(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 18× in last 7d / 45× 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. 2026-09-19 01:22 UTCEG score recompute
  2. 2026-09-19 01:22 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 01:11 UTCEG score recompute
  5. 2026-09-18 01:11 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 01:00 UTCEG score recompute
  8. 2026-09-17 01:00 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-16 00:49 UTCEG score recompute
  12. 2026-09-16 00:49 UTCGHSA enrichment
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 00:37 UTCGHSA enrichment
  16. 2026-09-14 00:26 UTCEG score recompute
  17. 2026-09-14 00:26 UTCGHSA enrichment
  18. 2026-09-13 00:15 UTCGHSA enrichment
  19. 2026-09-12 00:04 UTCEG score recompute
  20. 2026-09-12 00:04 UTCGHSA enrichment
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-10 23:52 UTCEG score recompute
  24. 2026-09-10 23:52 UTCGHSA enrichment
  25. 2026-09-09 23:32 UTCGHSA enrichment
Show 20 more
  1. 2026-09-08 23:13 UTCEG score recompute
  2. 2026-09-08 23:13 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 18:55 UTCGHSA enrichment
  5. 2026-09-06 18:44 UTCEG score recompute
  6. 2026-09-06 18:44 UTCGHSA enrichment
  7. 2026-09-06 13:48 UTCEPSS rescore
  8. 2026-09-05 18:32 UTCEG score recompute
  9. 2026-09-05 18:32 UTCGHSA enrichment
  10. 2026-09-05 15:31 UTCEPSS rescore
  11. 2026-09-04 18:21 UTCEG score recompute
  12. 2026-09-04 18:21 UTCGHSA enrichment
  13. 2026-09-04 05:07 UTCEPSS rescore
  14. 2026-09-03 18:02 UTCGHSA enrichment
  15. 2026-09-03 15:55 UTCEG score recompute
  16. 2026-09-03 15:54 UTCGHSA enrichment
  17. 2026-09-02 15:31 UTCEG score recompute
  18. 2026-09-02 15:08 UTCEG score recompute
  19. 2026-09-02 14:30 UTCEG score recompute
  20. 2026-09-02 14:26 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-83533?
CVE-2026-83533 is a medium vulnerability published on September 2, 2026. The WP Express Checkout WordPress plugin before 2.4.9 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.
When was CVE-2026-83533 disclosed?
CVE-2026-83533 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-83533 actively exploited?
CVE-2026-83533 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 98.3% of all scored CVEs.
What is the CVSS score of CVE-2026-83533?
CVE-2026-83533 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-83533?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-83533, 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-2026-83533

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