CVE-2026-9189

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-05-29. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

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

The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although cf7pp_paypal_ipn_handler() correctly validates IPN authenticity by posting back to PayPal with cmd=_notify-validate, it fails to compare the IPN payload's mc_gross (payment amount), mc_currency, or receiver_email fields against the corresponding stored order values before passing the attacker-controlled invoice field directly to cf7pp_complete_payment(), which marks the order completed after only an integer cast with no amount verification. This makes it possible for unauthenticated attackers to mark arbitrary high-value pending orders as fully paid by making a minimal real PayPal payment and crafting an IPN whose invoice parameter references the targeted order, effectively completing purchases without tendering the required payment amount.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
10.5%
KEV
Not listed

Published

May 29, 2026

Last Modified

May 29, 2026

References (8)

Vendor Advisories for CVE-2026-9189(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 12× in last 7d / 57× 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 110 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9189?
CVE-2026-9189 is a medium vulnerability published on May 29, 2026. The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although cf7pppaypalipnhandler() correctly validates IPN authenticity by posting back to PayPal with…
When was CVE-2026-9189 disclosed?
CVE-2026-9189 was first published in the National Vulnerability Database on May 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9189 actively exploited?
CVE-2026-9189 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9189?
CVE-2026-9189 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-9189?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9189, 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

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