CVE-2026-11855

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-06. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

The Simple Membership WordPress plugin before 4.7.5 does not verify the authenticity of Stripe webhook requests when no signing secret is configured, nor escape a value taken from them before outputting it in an administrator notice, allowing unauthenticated attackers to inject arbitrary web scripts that execute in the context of a logged-in administrator.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

July 6, 2026

Last Modified

July 6, 2026

Advisory Details (1)

Auto-updated Jul 6, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Simple Membership < 4.7.5 – Unauthenticated Stored XSS via Stripe Webhook API Version | CVE 2026-11855 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/217cb606-a0f2-4427-9262-cfe1cc90474e/

Vendor Advisories for CVE-2026-11855(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 10× in last 7d / 75× 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 189 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-11855?
CVE-2026-11855 is a high vulnerability published on July 6, 2026. The Simple Membership WordPress plugin before 4.7.5 does not verify the authenticity of Stripe webhook requests when no signing secret is configured, nor escape a value taken from them before outputting it in an administrator notice, allowing unauthenticated attackers to inject arbitrary web…
When was CVE-2026-11855 disclosed?
CVE-2026-11855 was first published in the National Vulnerability Database on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11855 actively exploited?
CVE-2026-11855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.4% of all scored CVEs.
What is the CVSS score of CVE-2026-11855?
CVE-2026-11855 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-11855?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11855, 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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