CVE-2026-66494

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. 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: cna:joomla, epss
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

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
8.7(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 10, 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 28× in last 7d / 63× 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. 2026-08-21 01:18 UTCEG score recompute
  2. 2026-08-21 01:18 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 14:18 UTCGHSA enrichment
  5. 2026-08-20 02:58 UTCEG score recompute
  6. 2026-08-20 02:58 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 15:57 UTCGHSA enrichment
  9. 2026-08-19 04:51 UTCGHSA enrichment
  10. 2026-08-18 17:51 UTCEG score recompute
  11. 2026-08-18 17:51 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 06:26 UTCGHSA enrichment
  14. 2026-08-17 19:24 UTCEG score recompute
  15. 2026-08-17 19:24 UTCGHSA enrichment
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 07:14 UTCGHSA enrichment
  18. 2026-08-16 20:14 UTCEG score recompute
  19. 2026-08-16 20:14 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 09:13 UTCEG score recompute
  22. 2026-08-16 09:13 UTCGHSA enrichment
  23. 2026-08-15 22:13 UTCGHSA enrichment
  24. 2026-08-15 11:12 UTCEG score recompute
  25. 2026-08-15 11:12 UTCGHSA enrichment
Show 38 more
  1. 2026-08-15 01:30 UTCEPSS rescore
  2. 2026-08-15 00:11 UTCGHSA enrichment
  3. 2026-08-14 13:10 UTCGHSA enrichment
  4. 2026-08-14 02:10 UTCEG score recompute
  5. 2026-08-14 02:10 UTCGHSA enrichment
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 15:09 UTCGHSA enrichment
  8. 2026-08-13 04:09 UTCGHSA enrichment
  9. 2026-08-12 17:08 UTCEG score recompute
  10. 2026-08-12 17:08 UTCGHSA enrichment
  11. 2026-08-12 13:51 UTCEPSS rescore
  12. 2026-08-12 06:07 UTCGHSA enrichment
  13. 2026-08-11 19:05 UTCEG score recompute
  14. 2026-08-11 19:05 UTCGHSA enrichment
  15. 2026-08-11 08:03 UTCEG score recompute
  16. 2026-08-11 08:03 UTCGHSA enrichment
  17. 2026-08-11 00:00 UTCEPSS rescore
  18. 2026-08-10 21:02 UTCGHSA enrichment
  19. 2026-08-10 10:01 UTCEG score recompute
  20. 2026-08-10 10:01 UTCGHSA enrichment
  21. 2026-08-10 01:20 UTCGHSA enrichment
  22. 2026-08-09 14:20 UTCEG score recompute
  23. 2026-08-09 14:20 UTCGHSA enrichment
  24. 2026-08-09 13:47 UTCEPSS rescore
  25. 2026-08-09 03:19 UTCEG score recompute
  26. 2026-08-09 03:19 UTCGHSA enrichment
  27. 2026-08-08 16:37 UTCEPSS rescore
  28. 2026-08-08 16:19 UTCGHSA enrichment
  29. 2026-08-08 05:18 UTCEG score recompute
  30. 2026-08-08 05:18 UTCGHSA enrichment
  31. 2026-08-08 04:22 UTCEG score recompute
  32. 2026-08-08 04:22 UTCGHSA enrichment
  33. 2026-08-08 02:28 UTCGHSA enrichment
  34. 2026-08-07 15:27 UTCEG score recompute
  35. 2026-08-07 14:58 UTCEG score recompute
  36. 2026-08-07 13:25 UTCEG score recompute
  37. 2026-08-07 13:13 UTCEG score recompute
  38. 2026-08-07 13:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 7, 2026, with the most recent update on August 10, 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% probability of exploitation in the next 30 days, which ranks it in the top 67.7% of all scored CVEs.
What is the CVSS score of CVE-2026-66494?
CVE-2026-66494 has a CVSS v4.0 base score of 8.7 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-66494?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66494, 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-2026-66494

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