CVE-2026-11901

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-07-11. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

The WP Hotel Booking plugin for WordPress is vulnerable to Insufficient Verification of Data Authenticity in all versions up to, and including, 2.3.1. This is due to the web_hook_process_paypal_standard() IPN handler selecting its PayPal validation endpoint from the attacker-controlled $_REQUEST['test_ipn'] parameter, force-upgrading any pending transaction to completed when test_ipn=1, and omitting post-verification checks on receiver_email, mc_currency, and txn_id uniqueness after receiving a VERIFIED response from PayPal. This makes it possible for unauthenticated attackers to mark arbitrary hotel bookings as fully paid without submitting genuine payment to the merchant — either by routing IPN validation through PayPal's sandbox using a free sandbox account, or by replaying a previously verified IPN from a nominal payment to an attacker-controlled PayPal account. An attacker requires only a free PayPal sandbox account (or any PayPal account) to obtain a VERIFIED response; no site credentials or special configuration are needed.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

July 11, 2026

Last Modified

July 14, 2026

References (10)

Vendor Advisories for CVE-2026-11901(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 9× in last 7d / 49× 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 147 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-11901?
CVE-2026-11901 is a medium vulnerability published on July 11, 2026. The WP Hotel Booking plugin for WordPress is vulnerable to Insufficient Verification of Data Authenticity in all versions up to, and including, 2.3.1. This is due to the webhookprocesspaypalstandard() IPN handler selecting its PayPal validation endpoint from the attacker-controlled…
When was CVE-2026-11901 disclosed?
CVE-2026-11901 was first published in the National Vulnerability Database on July 11, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11901 actively exploited?
CVE-2026-11901 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 82.0% of all scored CVEs.
What is the CVSS score of CVE-2026-11901?
CVE-2026-11901 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-11901?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11901, 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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