CVE-2026-16738

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 5.3 from GitHub Security Advisory published 2026-08-22. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: None knownExposed services: Not assessed

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

The CVE record's CNA (WPScan) lists Conekta Payment Gateway versions before 6.2.2 as affected. No release containing a fix is confirmed on record.

The Conekta Payment Gateway WordPress plugin before 6.2.2 does not verify the authenticity of incoming payment gateway webhook notifications, nor bind the confirmed payment to the targeted order or verify its amount, allowing unauthenticated attackers to mark arbitrary orders as paid without payment.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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 (value × EchelonGraph’s weight)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
24th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 22, 2026

Last Modified

October 12, 2026

Advisory Details (1)

Auto-updated Aug 23, 2026
No fix on record yet.
Web page

Conekta Payment Gateway < 6.2.2 – Unauthenticated Order Payment Completion via Webhook Forgery | CVE 2026-16738 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/89a2917e-032c-4f0f-be44-1a50b9d6fddf/

Vendor Advisories for CVE-2026-16738(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 14× in last 7d / 66× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 131 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  2. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  3. 2026-10-12 16:30 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  4. 2026-10-12 16:30 UTCEG score recompute
  5. 2026-10-11 20:09 UTCEG score recompute
  6. 2026-10-11 17:21 UTCEG score recompute
  7. 2026-10-11 14:54 UTCEG score recompute
  8. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  9. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  12. 2026-10-08 07:29 UTCEG score recompute
  13. 2026-10-08 07:29 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  14. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-10-07 05:15 UTCEG score recompute
  16. 2026-10-07 05:15 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  17. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  18. 2026-10-06 03:02 UTCEG score recompute
  19. 2026-10-06 03:02 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  20. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  21. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  22. 2026-10-04 20:47 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  23. 2026-10-03 16:39 UTCEG score recompute
  24. 2026-10-03 16:39 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  25. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
Show 75 more
  1. 2026-10-02 13:24 UTCEG score recompute
  2. 2026-10-02 13:24 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  3. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  4. 2026-10-01 11:11 UTCEG score recompute
  5. 2026-10-01 11:11 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  6. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-09-30 08:59 UTCEG score recompute
  8. 2026-09-30 08:59 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  9. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-09-29 06:46 UTCEG score recompute
  11. 2026-09-29 06:46 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  12. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-09-28 04:34 UTCEG score recompute
  14. 2026-09-28 04:34 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  15. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-09-27 02:22 UTCEG score recompute
  17. 2026-09-27 02:22 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  18. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-09-25 17:02 UTCEG score recompute
  20. 2026-09-25 17:02 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  21. 2026-09-24 12:22 UTCEG score recompute
  22. 2026-09-24 12:22 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  23. 2026-09-23 10:09 UTCEG score recompute
  24. 2026-09-23 10:09 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  25. 2026-09-22 07:57 UTCEG score recompute
  26. 2026-09-22 07:57 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  27. 2026-09-21 05:43 UTCEG score recompute
  28. 2026-09-21 05:43 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  29. 2026-09-20 02:18 UTCEG score recompute
  30. 2026-09-20 02:18 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  31. 2026-09-19 00:05 UTCEG score recompute
  32. 2026-09-19 00:05 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  33. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  34. 2026-09-17 21:53 UTCEG score recompute
  35. 2026-09-17 21:53 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  36. 2026-09-16 19:41 UTCEG score recompute
  37. 2026-09-16 19:41 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  38. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  39. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  40. 2026-09-15 15:13 UTCEG score recompute
  41. 2026-09-15 15:13 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  42. 2026-09-14 12:47 UTCEG score recompute
  43. 2026-09-14 12:47 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  44. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  45. 2026-09-13 10:34 UTCEG score recompute
  46. 2026-09-13 10:34 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  47. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  48. 2026-09-12 08:21 UTCEG score recompute
  49. 2026-09-12 08:21 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  50. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  51. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  52. 2026-09-11 06:08 UTCEG score recompute
  53. 2026-09-11 06:08 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  54. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  55. 2026-09-10 03:55 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  56. 2026-09-09 01:43 UTCEG score recompute
  57. 2026-09-09 01:43 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  58. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  59. 2026-09-07 20:59 UTCEG score recompute
  60. 2026-09-07 20:59 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  61. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  62. 2026-09-06 18:47 UTCEG score recompute
  63. 2026-09-06 18:47 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  64. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  65. 2026-09-05 16:34 UTCEG score recompute
  66. 2026-09-05 16:34 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  67. 2026-09-04 14:21 UTCEG score recompute
  68. 2026-09-04 14:21 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  69. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  70. 2026-09-03 12:08 UTCEG score recompute
  71. 2026-09-03 12:08 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  72. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  73. 2026-09-02 09:54 UTCEG score recompute
  74. 2026-09-02 09:53 UTCGHSA enrichmentGHSA-4vwp-q9wh-xxq2 · GitHub CVSS 5.3
  75. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile

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Frequently asked(5)

What is CVE-2026-16738?
CVE-2026-16738 is a medium-severity vulnerability; its CVE record was published on August 22, 2026. The Conekta Payment Gateway WordPress plugin before 6.2.2 does not verify the authenticity of incoming payment gateway webhook notifications, nor bind the confirmed payment to the targeted order or verify its amount, allowing unauthenticated attackers to mark arbitrary orders as paid without…
When was the CVE record for CVE-2026-16738 published?
The CVE record for CVE-2026-16738 was published on August 22, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 12, 2026; the record at its source may have been updated since.
Is CVE-2026-16738 actively exploited?
CVE-2026-16738 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16738?
CVE-2026-16738 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16738?
No fix for CVE-2026-16738 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (WPScan) lists Conekta Payment Gateway versions before 6.2.2 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-16738 are linked in the Vendor Advisories panel on this page.

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