CVE-2026-13399

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-07. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

The Payment Plugins for PayPal WooCommerce WordPress plugin before 2.0.20 does not have proper authorization checks on a REST endpoint, allowing unauthenticated users to bypass payments

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 7, 2026

Advisory Details (1)

Auto-updated Aug 6, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Payment Plugins for PayPal WooCommerce < 2.0.20 – Unauthenticated Payment Bypass via Reuse of a Completed PayPal Order | CVE 2026-13399 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/6ae19ba0-26ba-4ffa-94e3-3fe32cedcae1/

Vendor Advisories for CVE-2026-13399(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 60× 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. 2026-08-21 03:05 UTCEG score recompute
  2. 2026-08-21 03:05 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 14:37 UTCGHSA enrichment
  5. 2026-08-20 02:10 UTCEG score recompute
  6. 2026-08-20 02:10 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-19 13:43 UTCGHSA enrichment
  9. 2026-08-19 01:16 UTCEG score recompute
  10. 2026-08-19 01:16 UTCGHSA enrichment
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-18 12:48 UTCGHSA enrichment
  13. 2026-08-17 23:41 UTCEG score recompute
  14. 2026-08-17 23:41 UTCGHSA enrichment
  15. 2026-08-17 11:14 UTCGHSA enrichment
  16. 2026-08-16 22:46 UTCEG score recompute
  17. 2026-08-16 22:46 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 10:18 UTCEG score recompute
  20. 2026-08-16 10:18 UTCGHSA enrichment
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 21:52 UTCGHSA enrichment
  23. 2026-08-15 09:25 UTCEG score recompute
  24. 2026-08-15 09:25 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 35 more
  1. 2026-08-14 20:57 UTCGHSA enrichment
  2. 2026-08-14 08:30 UTCEG score recompute
  3. 2026-08-14 08:30 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 20:03 UTCGHSA enrichment
  6. 2026-08-13 07:36 UTCGHSA enrichment
  7. 2026-08-12 19:09 UTCEG score recompute
  8. 2026-08-12 19:09 UTCGHSA enrichment
  9. 2026-08-12 13:50 UTCEPSS rescore
  10. 2026-08-12 06:42 UTCGHSA enrichment
  11. 2026-08-11 18:15 UTCEG score recompute
  12. 2026-08-11 18:15 UTCGHSA enrichment
  13. 2026-08-11 13:42 UTCEPSS rescore
  14. 2026-08-11 05:35 UTCEG score recompute
  15. 2026-08-11 05:35 UTCGHSA enrichment
  16. 2026-08-10 23:59 UTCEPSS rescore
  17. 2026-08-10 17:07 UTCGHSA enrichment
  18. 2026-08-10 04:40 UTCGHSA enrichment
  19. 2026-08-09 16:13 UTCEG score recompute
  20. 2026-08-09 16:13 UTCGHSA enrichment
  21. 2026-08-09 13:46 UTCEPSS rescore
  22. 2026-08-09 03:47 UTCEG score recompute
  23. 2026-08-09 03:47 UTCGHSA enrichment
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-08 15:20 UTCGHSA enrichment
  26. 2026-08-08 02:53 UTCEG score recompute
  27. 2026-08-08 02:53 UTCGHSA enrichment
  28. 2026-08-07 14:26 UTCEG score recompute
  29. 2026-08-07 14:26 UTCGHSA enrichment
  30. 2026-08-07 14:13 UTCEG score recompute
  31. 2026-08-07 14:13 UTCGHSA enrichment
  32. 2026-08-07 10:44 UTCEG score recompute
  33. 2026-08-07 10:44 UTCGHSA enrichment
  34. 2026-08-06 22:18 UTCEG score recompute
  35. 2026-08-06 22:15 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13399?
CVE-2026-13399 is a high vulnerability published on August 6, 2026. The Payment Plugins for PayPal WooCommerce WordPress plugin before 2.0.20 does not have proper authorization checks on a REST endpoint, allowing unauthenticated users to bypass payments
When was CVE-2026-13399 disclosed?
CVE-2026-13399 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13399 actively exploited?
CVE-2026-13399 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 79.1% of all scored CVEs.
What is the CVSS score of CVE-2026-13399?
CVE-2026-13399 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-13399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13399, 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-2026-13399

Explore →

Is Your Infrastructure Affected by CVE-2026-13399?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs