ExploitedIn CISA KEVFix available

CVE-2026-56290

Q: Is CVE-2026-56290 actively exploited?

Yes. CVE-2026-56290 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-07-10.

Q: What is the CVSS score for CVE-2026-56290?

CVE-2026-56290 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation confirmed. First attested on 2026-07-07 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2026-06-29
Fixed in3.6.0
WeaknessCWE-434

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2026-06-2915:16CVE publishedNVD
2026-07-07Listed as exploited by GCVEGCVE
2026-07-07Exploitation first reportedCISA KEV
2026-07-07Added to the CISA KEV catalogCISA KEV
2026-07-0803:56SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-56290?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-56290?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Joomlack page builder ck

Branch	Affected	Fixed in	Source
3.6	< 3.6.0	3.6.0	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Joomlack page builder ck to 3.6.0
CISA’s required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-07-10

Advisories and patches

forum.joomlack.frPatch

Detection

read 2026-10-23 19:25 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 5 repositories, unverifiedsagsooz/PageBuilderCK-CVE-2026-56290-Exploitshinthink/pbck-exploitJenderal92/CVE-2026-56290ChiefYoru/CVE-2026-56290_PoCkatranSefa/CVE-2026-56290

CISA Known Exploited Vulnerability

Date Added: 2026-07-07
Patch Due Date: 2026-07-10
Ransomware Use: Unknown
Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Sources

CISA KEVKEV entry2026-07-07
GCVEexploitation2026-07-07
CISA-ADPSSVC decisionactive2026-07-08
OpenCVESSVC decisionactive—
CNACVSS 4.010read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
CNAweakness (CWE)CWE-434read 2026-10-23
NVDweakness (CWE)CWE-434read 2026-10-23
FIRST EPSSEPSS score30.9 %read 2026-10-23
PoC-in-GitHubproof of concept5read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Red
Published: 2026-06-29
Last Modified: 2026-10-07
NVD status: Analyzed

Frequently asked questions

What is CVE-2026-56290?

Is CVE-2026-56290 actively exploited?

Yes. CVE-2026-56290 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-07-10.

What is the CVSS score for CVE-2026-56290?

CVE-2026-56290 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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