CVE-2026-16038

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-07. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: Elevated riskExposed: 0

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

The MStore API WordPress plugin before 4.21.0 does not verify the payment with the payment gateway before marking an order as paid on several of its payment-completion endpoints, allowing an unauthenticated attacker to mark an arbitrary order fully paid without paying and obtain goods or services for free.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
72(Attend)
EG Risk 72/100SSVC: 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
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 7, 2026

Advisory Details (1)

Auto-updated Aug 7, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

MStore API < 4.21.0 – Unauthenticated Payment Bypass via Multiple Payment Gateways | CVE 2026-16038 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/6321d247-39c7-43a6-a528-202e1118a5d5/

Vendor Advisories for CVE-2026-16038(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 57× in last 7d / 115× 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.

Showing the most recent 100 of 115 total refreshes for this CVE.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 22:10 UTCGHSA enrichment
  3. 2026-08-20 18:09 UTCGHSA enrichment
  4. 2026-08-20 14:18 UTCGHSA enrichment
  5. 2026-08-20 10:07 UTCGHSA enrichment
  6. 2026-08-20 06:18 UTCGHSA enrichment
  7. 2026-08-20 02:27 UTCGHSA enrichment
  8. 2026-08-19 22:37 UTCGHSA enrichment
  9. 2026-08-19 18:47 UTCEG score recompute
  10. 2026-08-19 18:47 UTCGHSA enrichment
  11. 2026-08-19 17:03 UTCEPSS rescore
  12. 2026-08-19 13:04 UTCGHSA enrichment
  13. 2026-08-19 09:10 UTCGHSA enrichment
  14. 2026-08-19 05:21 UTCGHSA enrichment
  15. 2026-08-19 01:31 UTCGHSA enrichment
  16. 2026-08-18 21:41 UTCGHSA enrichment
  17. 2026-08-18 17:52 UTCEG score recompute
  18. 2026-08-18 17:51 UTCGHSA enrichment
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-18 12:48 UTCGHSA enrichment
  21. 2026-08-18 08:38 UTCGHSA enrichment
  22. 2026-08-18 04:46 UTCGHSA enrichment
  23. 2026-08-18 00:57 UTCGHSA enrichment
  24. 2026-08-17 21:02 UTCGHSA enrichment
  25. 2026-08-17 17:12 UTCEG score recompute
Show 75 more
  1. 2026-08-17 17:12 UTCGHSA enrichment
  2. 2026-08-17 13:47 UTCEPSS rescore
  3. 2026-08-17 13:23 UTCGHSA enrichment
  4. 2026-08-17 09:33 UTCGHSA enrichment
  5. 2026-08-17 05:44 UTCGHSA enrichment
  6. 2026-08-17 01:17 UTCGHSA enrichment
  7. 2026-08-16 21:28 UTCGHSA enrichment
  8. 2026-08-16 17:39 UTCEG score recompute
  9. 2026-08-16 17:39 UTCGHSA enrichment
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 13:41 UTCGHSA enrichment
  12. 2026-08-16 09:51 UTCGHSA enrichment
  13. 2026-08-16 06:02 UTCEG score recompute
  14. 2026-08-16 06:02 UTCGHSA enrichment
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-16 02:13 UTCGHSA enrichment
  17. 2026-08-15 22:24 UTCGHSA enrichment
  18. 2026-08-15 18:35 UTCGHSA enrichment
  19. 2026-08-15 14:46 UTCGHSA enrichment
  20. 2026-08-15 10:57 UTCGHSA enrichment
  21. 2026-08-15 07:08 UTCGHSA enrichment
  22. 2026-08-15 03:19 UTCEG score recompute
  23. 2026-08-15 03:19 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 23:30 UTCGHSA enrichment
  26. 2026-08-14 19:41 UTCGHSA enrichment
  27. 2026-08-14 15:52 UTCGHSA enrichment
  28. 2026-08-14 12:02 UTCGHSA enrichment
  29. 2026-08-14 08:13 UTCGHSA enrichment
  30. 2026-08-14 04:24 UTCGHSA enrichment
  31. 2026-08-14 00:35 UTCEG score recompute
  32. 2026-08-14 00:35 UTCGHSA enrichment
  33. 2026-08-13 22:00 UTCEPSS rescore
  34. 2026-08-13 20:45 UTCGHSA enrichment
  35. 2026-08-13 16:56 UTCGHSA enrichment
  36. 2026-08-13 13:07 UTCGHSA enrichment
  37. 2026-08-13 09:17 UTCGHSA enrichment
  38. 2026-08-13 05:28 UTCGHSA enrichment
  39. 2026-08-13 01:39 UTCGHSA enrichment
  40. 2026-08-12 21:50 UTCGHSA enrichment
  41. 2026-08-12 18:01 UTCGHSA enrichment
  42. 2026-08-12 14:12 UTCEG score recompute
  43. 2026-08-12 14:12 UTCGHSA enrichment
  44. 2026-08-12 13:50 UTCEPSS rescore
  45. 2026-08-12 10:23 UTCGHSA enrichment
  46. 2026-08-12 06:33 UTCGHSA enrichment
  47. 2026-08-12 02:44 UTCGHSA enrichment
  48. 2026-08-11 22:55 UTCGHSA enrichment
  49. 2026-08-11 19:05 UTCGHSA enrichment
  50. 2026-08-11 15:14 UTCEG score recompute
  51. 2026-08-11 15:14 UTCGHSA enrichment
  52. 2026-08-11 13:42 UTCEPSS rescore
  53. 2026-08-11 11:24 UTCGHSA enrichment
  54. 2026-08-11 07:35 UTCGHSA enrichment
  55. 2026-08-11 03:46 UTCEG score recompute
  56. 2026-08-11 03:46 UTCGHSA enrichment
  57. 2026-08-11 00:00 UTCEPSS rescore
  58. 2026-08-10 23:57 UTCGHSA enrichment
  59. 2026-08-10 20:07 UTCGHSA enrichment
  60. 2026-08-10 16:17 UTCGHSA enrichment
  61. 2026-08-10 12:28 UTCGHSA enrichment
  62. 2026-08-10 08:35 UTCGHSA enrichment
  63. 2026-08-10 04:45 UTCGHSA enrichment
  64. 2026-08-10 00:56 UTCGHSA enrichment
  65. 2026-08-09 21:07 UTCGHSA enrichment
  66. 2026-08-09 17:18 UTCEG score recompute
  67. 2026-08-09 17:18 UTCGHSA enrichment
  68. 2026-08-09 13:46 UTCEPSS rescore
  69. 2026-08-09 13:29 UTCGHSA enrichment
  70. 2026-08-09 09:40 UTCGHSA enrichment
  71. 2026-08-09 05:51 UTCGHSA enrichment
  72. 2026-08-09 02:02 UTCGHSA enrichment
  73. 2026-08-08 22:13 UTCGHSA enrichment
  74. 2026-08-08 18:24 UTCEG score recompute
  75. 2026-08-08 18:24 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16038?
CVE-2026-16038 is a critical vulnerability published on August 7, 2026. The MStore API WordPress plugin before 4.21.0 does not verify the payment with the payment gateway before marking an order as paid on several of its payment-completion endpoints, allowing an unauthenticated attacker to mark an arbitrary order fully paid without paying and obtain goods or services…
When was CVE-2026-16038 disclosed?
CVE-2026-16038 was first published in the National Vulnerability Database 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-2026-16038 actively exploited?
CVE-2026-16038 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 84.7% of all scored CVEs.
What is the CVSS score of CVE-2026-16038?
CVE-2026-16038 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16038?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16038, 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.

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