CVE-2026-66490

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-07-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: 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 - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Jul 29, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Build a Joomla Site — Joomla Website Builder Gridbox

https://www.balbooa.com/gridbox
generic🔴 Active Exploitation

Gridbox: 23 More Critical Vulnerabilities | mySites.guru

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

Vendor Advisories for CVE-2026-66490(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 15× in last 7d / 81× 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.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:20 UTCEG score recompute
  3. 2026-08-29 23:20 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-27 09:28 UTCEG score recompute
  6. 2026-08-27 09:28 UTCGHSA enrichment
  7. 2026-08-26 14:47 UTCEPSS rescore
  8. 2026-08-26 06:48 UTCEG score recompute
  9. 2026-08-26 06:48 UTCGHSA enrichment
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-25 07:08 UTCEG score recompute
  12. 2026-08-25 07:08 UTCGHSA enrichment
  13. 2026-08-24 07:39 UTCGHSA enrichment
  14. 2026-08-23 08:11 UTCEG score recompute
  15. 2026-08-23 08:11 UTCGHSA enrichment
  16. 2026-08-23 00:19 UTCEPSS rescore
  17. 2026-08-22 08:43 UTCEG score recompute
  18. 2026-08-22 08:43 UTCGHSA enrichment
  19. 2026-08-21 23:49 UTCEPSS rescore
  20. 2026-08-21 09:15 UTCEG score recompute
  21. 2026-08-21 09:15 UTCGHSA enrichment
  22. 2026-08-20 22:56 UTCEPSS rescore
  23. 2026-08-20 09:47 UTCEG score recompute
  24. 2026-08-20 09:47 UTCGHSA enrichment
  25. 2026-08-19 17:04 UTCEPSS rescore
Show 64 more
  1. 2026-08-19 10:18 UTCEG score recompute
  2. 2026-08-19 10:18 UTCGHSA enrichment
  3. 2026-08-18 13:48 UTCEPSS rescore
  4. 2026-08-18 10:51 UTCEG score recompute
  5. 2026-08-18 10:51 UTCGHSA enrichment
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-17 11:22 UTCEG score recompute
  8. 2026-08-17 11:22 UTCGHSA enrichment
  9. 2026-08-16 14:56 UTCEPSS rescore
  10. 2026-08-16 11:54 UTCEG score recompute
  11. 2026-08-16 11:54 UTCGHSA enrichment
  12. 2026-08-15 12:27 UTCEG score recompute
  13. 2026-08-15 12:27 UTCGHSA enrichment
  14. 2026-08-15 01:30 UTCEPSS rescore
  15. 2026-08-14 12:58 UTCEG score recompute
  16. 2026-08-14 12:58 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 13:30 UTCGHSA enrichment
  19. 2026-08-12 14:02 UTCEG score recompute
  20. 2026-08-12 14:02 UTCGHSA enrichment
  21. 2026-08-12 13:51 UTCEPSS rescore
  22. 2026-08-12 13:48 UTCGHSA enrichment
  23. 2026-08-11 14:20 UTCEG score recompute
  24. 2026-08-11 14:20 UTCGHSA enrichment
  25. 2026-08-11 00:00 UTCEPSS rescore
  26. 2026-08-10 14:52 UTCGHSA enrichment
  27. 2026-08-09 15:24 UTCEG score recompute
  28. 2026-08-09 15:24 UTCGHSA enrichment
  29. 2026-08-09 13:47 UTCEPSS rescore
  30. 2026-08-08 16:37 UTCEPSS rescore
  31. 2026-08-08 15:56 UTCEG score recompute
  32. 2026-08-08 15:56 UTCGHSA enrichment
  33. 2026-08-07 16:27 UTCGHSA enrichment
  34. 2026-08-06 16:59 UTCEG score recompute
  35. 2026-08-06 16:59 UTCGHSA enrichment
  36. 2026-08-06 13:47 UTCEPSS rescore
  37. 2026-08-05 19:17 UTCEPSS rescore
  38. 2026-08-05 19:17 UTCEPSS rescore
  39. 2026-08-05 17:31 UTCGHSA enrichment
  40. 2026-08-05 12:26 UTCEG score recompute
  41. 2026-08-05 12:26 UTCGHSA enrichment
  42. 2026-08-04 15:10 UTCEPSS rescore
  43. 2026-08-04 12:32 UTCEG score recompute
  44. 2026-08-04 12:32 UTCGHSA enrichment
  45. 2026-08-04 10:39 UTCEPSS rescore
  46. 2026-08-03 12:04 UTCEG score recompute
  47. 2026-08-03 12:04 UTCGHSA enrichment
  48. 2026-08-03 10:36 UTCEPSS rescore
  49. 2026-08-02 12:34 UTCEG score recompute
  50. 2026-08-02 12:34 UTCGHSA enrichment
  51. 2026-08-02 02:27 UTCEPSS rescore
  52. 2026-08-01 13:05 UTCEG score recompute
  53. 2026-08-01 13:05 UTCGHSA enrichment
  54. 2026-08-01 04:16 UTCEPSS rescore
  55. 2026-07-31 13:37 UTCEG score recompute
  56. 2026-07-31 13:37 UTCGHSA enrichment
  57. 2026-07-30 16:28 UTCEPSS rescore
  58. 2026-07-30 14:08 UTCEG score recompute
  59. 2026-07-30 14:08 UTCGHSA enrichment
  60. 2026-07-29 15:21 UTCEG score recompute▲ 6.10
  61. 2026-07-29 15:20 UTCNVD updateCVSS v3 → 6.1 · severity → MEDIUM
  62. 2026-07-29 14:18 UTCNVD update
  63. 2026-07-29 13:58 UTCEG score recompute
  64. 2026-07-29 13:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66490?
CVE-2026-66490 is a medium vulnerability published on July 29, 2026. Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2
When was CVE-2026-66490 disclosed?
CVE-2026-66490 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-2026-66490 actively exploited?
CVE-2026-66490 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 95.1% of all scored CVEs.
What is the CVSS score of CVE-2026-66490?
CVE-2026-66490 has a CVSS v3.1 base score of 6.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-66490?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66490, 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

Explore the affected products and dependency analysis for CVE-2026-66490

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