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
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: None knownExposed: 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)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
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 6× in last 7d / 68× 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 205 total refreshes for this CVE.

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

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 1% probability of exploitation in the next 30 days, which ranks it in the top 49.8% of all scored CVEs.
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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