CVE-2026-8365

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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
8.8EG
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 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(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
63%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 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 11× in last 7d / 94× 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 223 total refreshes for this CVE.

  1. 2026-08-28 21:42 UTCEPSS rescore
  2. 2026-08-27 14:25 UTCEPSS rescore
  3. 2026-08-26 14:47 UTCEPSS rescore
  4. 2026-08-25 13:49 UTCEPSS rescore
  5. 2026-08-25 00:54 UTCEG score recompute
  6. 2026-08-25 00:54 UTCGHSA enrichment
  7. 2026-08-24 14:18 UTCEPSS rescore
  8. 2026-08-24 00:17 UTCGHSA enrichment
  9. 2026-08-23 11:18 UTCEG score recompute
  10. 2026-08-23 11:18 UTCGHSA enrichment
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-22 01:25 UTCEG score recompute
  13. 2026-08-22 01:25 UTCGHSA enrichment
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 12:25 UTCEG score recompute
  16. 2026-08-21 12:25 UTCGHSA enrichment
  17. 2026-08-20 22:56 UTCEPSS rescore
  18. 2026-08-20 22:22 UTCGHSA enrichment
  19. 2026-08-20 09:22 UTCEG score recompute
  20. 2026-08-20 09:22 UTCGHSA enrichment
  21. 2026-08-19 17:04 UTCEPSS rescore
  22. 2026-08-18 13:49 UTCEPSS rescore
  23. 2026-08-18 13:49 UTCEPSS rescore
  24. 2026-08-17 13:57 UTCEG score recompute
  25. 2026-08-17 13:57 UTCGHSA enrichment
Show 75 more
  1. 2026-08-17 13:47 UTCEPSS rescore
  2. 2026-08-17 00:59 UTCEG score recompute
  3. 2026-08-17 00:59 UTCGHSA enrichment
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-16 14:56 UTCEPSS rescore
  6. 2026-08-16 07:59 UTCEG score recompute
  7. 2026-08-16 07:59 UTCGHSA enrichment
  8. 2026-08-16 02:15 UTCEPSS rescore
  9. 2026-08-15 19:01 UTCGHSA enrichment
  10. 2026-08-15 06:02 UTCEG score recompute
  11. 2026-08-15 06:02 UTCGHSA enrichment
  12. 2026-08-15 01:31 UTCEPSS rescore
  13. 2026-08-14 16:57 UTCGHSA enrichment
  14. 2026-08-14 03:59 UTCEG score recompute
  15. 2026-08-14 03:59 UTCGHSA enrichment
  16. 2026-08-13 22:00 UTCEPSS rescore
  17. 2026-08-13 15:00 UTCGHSA enrichment
  18. 2026-08-13 00:49 UTCEG score recompute
  19. 2026-08-13 00:49 UTCGHSA enrichment
  20. 2026-08-12 13:51 UTCEPSS rescore
  21. 2026-08-12 11:51 UTCGHSA enrichment
  22. 2026-08-11 22:52 UTCEG score recompute
  23. 2026-08-11 22:52 UTCGHSA enrichment
  24. 2026-08-11 13:43 UTCEPSS rescore
  25. 2026-08-11 09:53 UTCEG score recompute
  26. 2026-08-11 09:53 UTCGHSA enrichment
  27. 2026-08-11 00:00 UTCEPSS rescore
  28. 2026-08-10 20:54 UTCGHSA enrichment
  29. 2026-08-10 04:02 UTCGHSA enrichment
  30. 2026-08-09 15:03 UTCEG score recompute
  31. 2026-08-09 15:03 UTCGHSA enrichment
  32. 2026-08-09 13:47 UTCEPSS rescore
  33. 2026-08-09 02:05 UTCEG score recompute
  34. 2026-08-09 02:05 UTCGHSA enrichment
  35. 2026-08-08 16:37 UTCEPSS rescore
  36. 2026-08-08 13:06 UTCGHSA enrichment
  37. 2026-08-08 00:07 UTCEG score recompute
  38. 2026-08-08 00:07 UTCGHSA enrichment
  39. 2026-08-07 11:08 UTCGHSA enrichment
  40. 2026-08-06 22:10 UTCEG score recompute
  41. 2026-08-06 22:10 UTCGHSA enrichment
  42. 2026-08-06 13:47 UTCEPSS rescore
  43. 2026-08-06 09:11 UTCGHSA enrichment
  44. 2026-08-05 20:12 UTCEG score recompute
  45. 2026-08-05 20:12 UTCGHSA enrichment
  46. 2026-08-05 19:17 UTCEPSS rescore
  47. 2026-08-05 19:17 UTCEPSS rescore
  48. 2026-08-04 17:12 UTCEG score recompute
  49. 2026-08-04 17:12 UTCGHSA enrichment
  50. 2026-08-04 15:10 UTCEPSS rescore
  51. 2026-08-04 10:39 UTCEPSS rescore
  52. 2026-08-04 04:13 UTCGHSA enrichment
  53. 2026-08-03 15:14 UTCEG score recompute
  54. 2026-08-03 15:14 UTCGHSA enrichment
  55. 2026-08-03 10:36 UTCEPSS rescore
  56. 2026-08-03 01:23 UTCGHSA enrichment
  57. 2026-08-02 12:24 UTCEG score recompute
  58. 2026-08-02 12:24 UTCGHSA enrichment
  59. 2026-08-02 02:27 UTCEPSS rescore
  60. 2026-08-01 23:25 UTCGHSA enrichment
  61. 2026-08-01 10:26 UTCEG score recompute
  62. 2026-08-01 10:26 UTCGHSA enrichment
  63. 2026-08-01 04:16 UTCEPSS rescore
  64. 2026-07-31 18:05 UTCGHSA enrichment
  65. 2026-07-31 04:41 UTCEG score recompute
  66. 2026-07-31 04:41 UTCGHSA enrichment
  67. 2026-07-30 16:28 UTCEPSS rescore
  68. 2026-07-30 11:14 UTCEG score recompute
  69. 2026-07-30 11:14 UTCGHSA enrichment
  70. 2026-07-30 01:30 UTCEPSS rescore
  71. 2026-07-29 05:29 UTCEG score recompute
  72. 2026-07-29 05:29 UTCGHSA enrichment
  73. 2026-07-28 15:37 UTCEPSS rescore
  74. 2026-07-28 02:47 UTCEG score recompute
  75. 2026-07-28 02:47 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, with the most recent update on July 23, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 36.6% of all scored CVEs.
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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