CVE-2026-65884

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-29. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Joomla Extension - balbooa.com - Privilege Escalation in Gridbox < 2.20.2 - The registration method allows users provided usergroup IDs, allowing unauthenticated actors to register new accounts with administrative permissions.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

Gridbox: 23 More Critical Vulnerabilities | mySites.guru

https://mysites.guru/blog/gridbox-23-critical-vulnerabilities/
generic

Build a Joomla Site — Joomla Website Builder Gridbox

https://www.balbooa.com/gridbox

Vendor Advisories for CVE-2026-65884(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 36× in last 7d / 164× 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 326 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-65884?
CVE-2026-65884 is a critical vulnerability published on July 29, 2026. Joomla Extension - balbooa.com - Privilege Escalation in Gridbox < 2.20.2 - The registration method allows users provided usergroup IDs, allowing unauthenticated actors to register new accounts with administrative permissions.
When was CVE-2026-65884 disclosed?
CVE-2026-65884 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65884 actively exploited?
CVE-2026-65884 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.1% of all scored CVEs.
What is the CVSS score of CVE-2026-65884?
CVE-2026-65884 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-65884?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-65884, 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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