CVE-2026-9227

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-28. NVD baseline CVSS 8.8; sources differ by 0.0.

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

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

The GutenBee – Gutenberg Blocks plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.20.1 via the gutenbee_file_and_ext_json function. This is due to a flawed strpos() substring check that only verifies whether the filename contains the string '.json' rather than confirming the filename ends with a .json extension, allowing double-extension filenames like shell.json.php to bypass validation. This makes it possible for authenticated attackers, with author-level access and above, to upload files that may be executable, which makes remote code execution possible.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
47.3%
KEV
Not listed

Published

May 28, 2026

Last Modified

May 28, 2026

Advisory Details (1)

Auto-updated Jun 2, 2026
Patch available. Sources: github_commit.
github_commit Patch Available

commit bde934cdecf6 (cssigniter/gutenbee)

Patch available: cssigniter/gutenbee 2.20.2 (contains commit bde934cdecf6)

https://github.com/cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc6690e5

Vendor Advisories for CVE-2026-9227(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 / 64× 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 146 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-9227?
CVE-2026-9227 is a high vulnerability published on May 28, 2026. The GutenBee – Gutenberg Blocks plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.20.1 via the gutenbeefileandextjson function. This is due to a flawed strpos() substring check that only verifies whether the filename contains the string '.json'…
When was CVE-2026-9227 disclosed?
CVE-2026-9227 was first published in the National Vulnerability Database on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9227 actively exploited?
CVE-2026-9227 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9227?
CVE-2026-9227 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-9227?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9227, 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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