CVE-2026-66494

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.7Exploit: None knownExposed services: Not assessed

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

Joomla Extension - joomshaper.com - Unauthenticated stored XSS in Shapes API endpoint SP Page Builder < 6.7.0 - An unauthenticated attacker can store malicious JavaScript in a Joomla site's database via a single HTTP request. When an administrator opens the SP Page Builder editor, the JavaScript executes in their browser automatically..

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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
Severity87% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 7, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 7, 2026
No patch confirmed yet.
generic

SP Page Builder - The Best Joomla Drag & Drop Page Builder - JoomShaper

https://www.joomshaper.com/page-builder

Vendor Advisories for CVE-2026-66494(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 88× 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 204 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-66494?
CVE-2026-66494 is a high vulnerability published on August 7, 2026. Joomla Extension - joomshaper.com - Unauthenticated stored XSS in Shapes API endpoint SP Page Builder < 6.7.0 - An unauthenticated attacker can store malicious JavaScript in a Joomla site's database via a single HTTP request. When an administrator opens the SP Page Builder editor, the JavaScript…
When was CVE-2026-66494 disclosed?
CVE-2026-66494 was first published on August 7, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66494 actively exploited?
CVE-2026-66494 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66494?
CVE-2026-66494 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-66494?
No fix for CVE-2026-66494 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-66494 are linked in the Vendor Advisories panel on this page.

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