CVE-2026-56290

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-07-07), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 31%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

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

Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0 - The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
31%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

June 29, 2026

Last Modified

August 12, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Joomlack - Extensions et tutoriels Joomla! - JoomlaCK - Extensions et tutoriels Joomla!

https://www.joomlack.fr/
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290
generic🔴 Active Exploitation

PageBuilder CK RCE - CVE-2026-56290 | mySites.guru

https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/
generic

Nouvelle version de pbck et joomla 3 - JoomlaCK forum

https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3

Vendor Advisories for CVE-2026-56290(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 60× in last 7d / 241× 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 660 total refreshes for this CVE.

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

Publicly available exploits

(5 references)

Working exploit code is in the public domain (3 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52626
    First seen Jul 8, 2026

    Joomla Page Builder CK 3.5.10 - Arbitrary File Upload

    Open source ↗
  • GitHub PoCJenderal92/CVE-2026-56290
    First seen Jul 8, 2026

    CVE-2026-56290 - Mass Exploit for Joomla Com_pagebuilderck component (Unrestricted File Upload → RCE). Multi-threaded, automatic CSRF bypass, PHP shell uploader.

    Open source ↗
  • GitHub PoCshinthink/pbck-exploit
    First seen Jul 4, 2026

    📤 Mass exploitation framework for CVE-2026-56290 — Page Builder CK Joomla unauthenticated file upload to RCE

    Open source ↗
  • GitHub PoCsagsooz/PageBuilderCK-CVE-2026-56290-Exploit
    First seen Jul 3, 2026

    Page Builder CK for Joomla - Unauthenticated SSRF / Remote File Write leading to PHP execution Exploiter

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-56290.yaml
    First seen Jan 1, 2026

    Page Builder CK <= 3.5.10 - Unauthenticated Arbitrary File Upload

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-56290?
CVE-2026-56290 is a critical vulnerability published on June 29, 2026. Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0 - The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
When was CVE-2026-56290 disclosed?
CVE-2026-56290 was first published in the National Vulnerability Database on June 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-2026-56290 actively exploited?
Yes. CISA added CVE-2026-56290 to the Known Exploited Vulnerabilities catalog on July 7, 2026, affecting Joomlack Page Builder. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-56290?
CVE-2026-56290 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2026-56290?
CVE-2026-56290 affects Joomlack Page Builder. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-56290?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56290, 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-2026-56290

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