CVE-2026-8365

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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 Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksy_sanitize_post_meta_options() function, which only blocks values containing '<' or '>' and does not prevent serialized PHP object strings from being stored in post meta, combined with the SearchReplacer::run_recursively() function unconditionally deserializing all string values via @unserialize() during migration without restricting allowed classes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a serialized Blocksy\RaiiPattern object into post meta that, when the V200 migration runs on an upgraded site, is deserialized and triggers RaiiPattern::__destruct(), which executes arbitrary PHP callables via call_user_func().

CVSS v3
8.8
EG Score
8.8(high)
EPSS
53.7%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 9, 2026

References (13)

Vendor Advisories for CVE-2026-8365(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 30× in last 7d / 129× 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 129 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8365?
CVE-2026-8365 is a high vulnerability published on June 9, 2026. The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksymeta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksysanitizepostmetaoptions()…
When was CVE-2026-8365 disclosed?
CVE-2026-8365 was first published in the National Vulnerability Database on June 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8365 actively exploited?
CVE-2026-8365 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 53.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8365?
CVE-2026-8365 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-8365?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8365, 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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