What’s Vulnerable › Vulnerabilities

CVE-2021-47964: Schlix CMS 2.2.6-6 Remote Code Execution via core.blockmanager

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-15 · updated 2026-06-17
• Weakness: CWE-94

Description

Schlix CMS 2.2.6-6 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary PHP code by uploading malicious extension packages through the block manager. Attackers can upload a crafted ZIP file containing PHP code in the packageinfo.inc file and trigger execution by accessing the About tab of the installed extension.

Affected products

• Schlix CMS: 2.2.6-6

References

• https://www.exploit-db.com/exploits/49838
• https://www.schlix.com/
• https://www.schlix.com/downloads/schlix-cms/schlix-cms-v2.2.6-6.zip
• https://www.vulncheck.com/advisories/schlix-cms-6-remote-code-execution-via-core-blockmanager

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