CVE-2026-67398

HIGHPre-NVD 8.28.2
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (39th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.2Exploit: 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 (HackerOne) lists WebPros WHMCS versions 4.5.0 up to but not including 8.12.2, 8.13.0 up to but not including 8.13.7 and 9.0.0 up to but not including 9.0.8 as affected. No release containing a fix is confirmed on record.

Missing authorization vulnerability has been discovered in 2Checkout payment gateway of WHMCS from 8.13.0 before 8.13.7, from 9.0.0 before 9.0.8, all other EOL versions from 4.5.0. The vulnerability allows an unauthenticated user to get WHMCS customer's data via 2Checkout payment gateway's endpoint under specific conditions.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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)
Severity82% × 45%
The EG Score, 8.2 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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

September 3, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 4, 2026
No fix on record yet.
Web page

CVE-2026-67398 - WHMCS Security Update 2026-09-03 | Other | Guides & Tutorials

https://help.whmcs.com/m/125386/l/2116695-cve-2026-67398-whmcs-security-update-2026-09-03

Vendor Advisories for CVE-2026-67398(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 20× in last 7d / 107× 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 151 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 51 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-13 10:26 UTCEG score recompute
  4. 2026-10-13 10:26 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-10-12 15:45 UTCEG score recompute
  7. 2026-10-11 19:30 UTCEG score recompute
  8. 2026-10-11 16:46 UTCEG score recompute
  9. 2026-10-11 14:07 UTCEG score recompute
  10. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-10-10 10:54 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  13. 2026-10-09 23:23 UTCEG score recompute
  14. 2026-10-09 23:23 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  15. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-09 01:22 UTCEG score recompute
  17. 2026-10-09 01:22 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  18. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-10-07 23:21 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  21. 2026-10-07 03:54 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  22. 2026-10-06 16:24 UTCEG score recompute
  23. 2026-10-06 16:24 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  24. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-10-06 04:52 UTCEG score recompute
Show 75 more
  1. 2026-10-06 04:52 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  2. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  3. 2026-10-05 16:39 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  4. 2026-10-05 04:21 UTCEG score recompute
  5. 2026-10-05 04:21 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  6. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  7. 2026-10-04 16:47 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  8. 2026-10-04 05:16 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  9. 2026-10-03 17:47 UTCEG score recompute
  10. 2026-10-03 17:47 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-10-03 06:18 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  13. 2026-10-02 18:48 UTCEG score recompute
  14. 2026-10-02 18:48 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  15. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  16. 2026-10-02 07:07 UTCEG score recompute
  17. 2026-10-02 07:07 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  19. 2026-10-01 19:36 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  20. 2026-10-01 06:34 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  21. 2026-09-30 19:04 UTCEG score recompute
  22. 2026-09-30 19:04 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-09-30 02:49 UTCEG score recompute
  25. 2026-09-30 02:49 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  26. 2026-09-29 12:29 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  27. 2026-09-29 00:59 UTCEG score recompute
  28. 2026-09-29 00:59 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  29. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  30. 2026-09-28 13:28 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  31. 2026-09-28 01:58 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  32. 2026-09-27 14:25 UTCEG score recompute
  33. 2026-09-27 14:25 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  34. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  35. 2026-09-27 02:56 UTCEG score recompute
  36. 2026-09-27 02:56 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  37. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  38. 2026-09-26 15:26 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  39. 2026-09-26 03:21 UTCEG score recompute
  40. 2026-09-26 03:20 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  41. 2026-09-25 13:30 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  42. 2026-09-25 01:54 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  43. 2026-09-24 14:24 UTCEG score recompute
  44. 2026-09-24 14:24 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  45. 2026-09-24 02:41 UTCEG score recompute
  46. 2026-09-24 02:41 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  47. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  48. 2026-09-23 15:12 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  49. 2026-09-23 03:42 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  50. 2026-09-22 16:12 UTCEG score recompute
  51. 2026-09-22 16:12 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  52. 2026-09-22 04:39 UTCEG score recompute
  53. 2026-09-22 04:38 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  54. 2026-09-21 17:09 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  55. 2026-09-21 05:07 UTCEG score recompute
  56. 2026-09-21 05:07 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  57. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  58. 2026-09-20 17:38 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  59. 2026-09-20 05:59 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  60. 2026-09-19 18:30 UTCEG score recompute
  61. 2026-09-19 18:30 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  62. 2026-09-19 07:00 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  63. 2026-09-18 19:31 UTCEG score recompute
  64. 2026-09-18 19:31 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  65. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  66. 2026-09-18 08:02 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  67. 2026-09-17 20:32 UTCEG score recompute
  68. 2026-09-17 20:32 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  69. 2026-09-17 08:49 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  70. 2026-09-16 21:19 UTCEG score recompute
  71. 2026-09-16 21:19 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  72. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  73. 2026-09-16 09:02 UTCEG score recompute
  74. 2026-09-16 09:02 UTCGHSA enrichmentGHSA-x84h-g4q5-82g8 · GitHub severity HIGH
  75. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67398?
CVE-2026-67398 is a high-severity vulnerability; its CVE record was published on September 3, 2026. Missing authorization vulnerability has been discovered in 2Checkout payment gateway of WHMCS from 8.13.0 before 8.13.7, from 9.0.0 before 9.0.8, all other EOL versions from 4.5.0. The vulnerability allows an unauthenticated user to get WHMCS customer's data via 2Checkout payment gateway's endpoint…
When was the CVE record for CVE-2026-67398 published?
The CVE record for CVE-2026-67398 was published on September 3, 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 September 14, 2026; the record at its source may have been updated since.
Is CVE-2026-67398 actively exploited?
CVE-2026-67398 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67398?
CVE-2026-67398 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-67398?
No fix for CVE-2026-67398 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 (HackerOne) lists WebPros WHMCS versions 4.5.0 up to but not including 8.12.2, 8.13.0 up to but not including 8.13.7 and 9.0.0 up to but not including 9.0.8 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-67398 are linked in the Vendor Advisories panel on this page.

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