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CISA has added two Joomla extension vulnerabilities to its Known Exploited Vulnerabilities catalog after confirming active exploitation against SP Page Builder and Page Builder CK. The flaws, tracked as CVE-2026-48908 and CVE-2026-56290, are unauthenticated arbitrary file upload bugs that allow attackers to place malicious files on exposed Joomla sites and achieve remote code execution.
Security reporting says the vulnerabilities have been used to upload web shells, deploy PHP file-manager backdoors, and create hidden administrator accounts for persistence on compromised systems. Vendor fixes are available, including SP Page Builder 6.6.2 for the zero-day issue, and defenders are being urged to patch immediately or temporarily disable the affected extensions and restrict public access to vulnerable upload endpoints until remediation is complete.
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3 events from the most recent confirmed update back to the earliest known activity.
CISA added CVE-2026-48908 and CVE-2026-56290 to its Known Exploited Vulnerabilities catalog after confirming active exploitation in the wild. The advisory says attackers had used the flaws to upload web shells, deploy PHP file manager backdoors, and create hidden administrator accounts.
A disclosure detailed an unauthenticated file upload vulnerability in Page Builder CK that could lead to remote code execution on vulnerable Joomla sites. The issue was later identified as CVE-2026-56290 in the provided references.
A zero-day unauthenticated file upload vulnerability affecting SP Page Builder was fixed by the vendor in version 6.6.2. The flaw could allow remote code execution on vulnerable Joomla sites.
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A critical vulnerability, **`CVE-2026-56290`**, affects the Joomla **Page Builder CK** extension before version **3.6.0** and allows **unauthenticated arbitrary file upload**. The flaw can let remote attackers upload executable files and achieve **full remote code execution**, and it has been assigned a **CVSS 4.0 score of 10.0**. Belgium’s Centre for Cybersecurity issued a warning urging organizations to patch immediately because exposed Joomla sites using the vulnerable extension could be compromised without authentication. Advisories recommend upgrading **Page Builder CK** to **3.6.0 or later**, restricting upload permissions, and validating allowed file types to reduce exposure. Related vulnerability reporting published at the same time also highlighted a separate critical web CMS plugin issue, **`CVE-2026-57331`**, in the WordPress **Paid Videochat Turnkey Site** plugin through **7.4.8**, where an **arbitrary file deletion** flaw rated **CVSS 9.9** was remediated in **7.4.9** or later, underscoring continued risk from insecure file-handling bugs in widely deployed content management extensions.
Jul 1, 2026
FortiGuard Labs reported ongoing in-the-wild exploitation of **CVE-2026-48908**, a critical `CVSS 10.0` unauthenticated remote code execution flaw in the JoomShaper **SP Page Builder** extension for Joomla. The bug stems from an unrestricted file upload in the `asset.uploadCustomIcon` functionality that lets attackers upload and execute arbitrary PHP files, enabling full server compromise. Public proof-of-concept exploit code is available, and the vulnerability was added to CISA’s Known Exploited Vulnerabilities catalog after active abuse was confirmed. FortiGuard said exploitation has remained elevated, with **1,210 blocked attempts in 24 hours** and **15,626 over 7 days**, indicating sustained automated scanning of Internet-facing Joomla servers. The highest attack volumes were observed against organizations in **Poland, Turkey, Australia, and the United States**, with **Telecommunications/Carrier** and **Technology** among the most targeted sectors. Defenders were urged to upgrade to **SP Page Builder 6.6.2 or later**, restrict public access to Joomla administrative interfaces, block PHP execution in upload directories, and investigate for **web shells**, suspicious files, unauthorized administrator accounts, and other persistence because patching alone does not remove an existing compromise.
Jul 19, 2026
Joomla disclosed two high-severity core vulnerabilities affecting its platform: **CVE-2026-23898**, an input-validation flaw in the `com_joomlaupdate` autoupdate server mechanism that can lead to arbitrary file deletion, and **CVE-2026-23899**, an improper access-control issue in webservice endpoints that can permit unauthorized access. Both issues are remotely exploitable over the network with low attack complexity, according to the published CVSS v4.0 vectors. The file-deletion bug is mapped to **CWE-73** and the webservice issue to **CWE-284**. Joomla said both vulnerabilities carry high potential impact across confidentiality, integrity, and availability, while requiring high privileges, and published separate security advisories through its developer portal. The disclosures indicate risk to core Joomla deployments that rely on the affected update and webservice functionality, making patch review and access-control validation a priority for administrators.
Jun 29, 2026