CVE-2026-48908: JoomShaper SP Page Builder Unrestricted Upload of File with Dangerous Type Vulnerability

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Yes, if you run JoomShaper SP Page Builder. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-07-07, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-07-10; treat that as the outer limit, not the target.
• EPSS 88.5%, percentile 99.8: FIRST’s model estimates a 88.5% chance of exploitation activity in the next 30 days, higher than 99.8% of all scored CVEs (very high). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Editorial verdict: Act now. SP Page Builder CVE-2026-48908: Exploited Joomla RCE — Any Joomla site still on SP Page Builder 6.6.1 or older should be updated today and treated as compromised, because automated attacks have been planting web shells and admin accounts since June.

What it is

A vulnerability in SP Page Builder for Joomla allows unauthenticated users to upload arbitrary files, ultimately resulting in the upload and execution of PHP code.

CISA’s summary

JoomShaper SP Page Builder contains an unrestricted upload of file with dangerous type vulnerability that allows unauthenticated users to upload arbitrary files, ultimately resulting in the upload and execution of PHP code.

Weakness type: CWE-434.

Product: JoomShaper SP Page Builder · Assigned by: Joomla · Published: 2026-06-20

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: none
• Privileges required: none (no login)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: added 2026-07-07; federal due date 2026-07-10. Known ransomware use: Unknown.
• CISA 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.
• CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
• FIRST EPSS (model of 2026-10-21): 88.51% probability of exploitation activity in the next 30 days; percentile 99.8.

Timeline

• 2026-06-15 — erroneo.us brief: SP Page Builder CVE-2026-48908: Exploited Joomla RCE
• 2026-06-20 — CVE record published by Joomla
• 2026-07-07 — Added to CISA’s Known Exploited Vulnerabilities catalog
• 2026-07-10 — CISA remediation deadline for US federal agencies
• 2026-10-08 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. joomshaper.com joomshaper.com
2. extensions.joomla.org extensions.joomla.org

Vulnerability records

1. CVE.org record CVE-2026-48908 cve.org
2. NVD entry CVE-2026-48908 nvd.nist.gov

Government

1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov
2. Listed in CISA KEV notes (cisa.gov) cisa.gov
3. Listed in CISA KEV notes (cisa.gov) cisa.gov

Other references from the CVE record and advisory

1. joomshaper.com joomshaper.com
2. mysites.guru mysites.guru

All exploited JoomShaper vulnerabilities · Today’s Security Digest