What’s Vulnerable › Vulnerabilities

CVE-2020-11476

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-07-28 · updated 2026-06-17
• Weakness: CWE-434

Description

Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.

Affected products

• Concrete CMS: before 8.5.3 — fixed in 8.5.3

How to fix

Upgrade to a fixed version: Concrete CMS 8.5.3. Check the vendor advisory for mitigations.

References

• https://github.com/concrete5/concrete5/pull/8713
• https://github.com/concrete5/concrete5/releases/tag/8.5.3
• https://herolab.usd.de/security-advisories/
• https://herolab.usd.de/security-advisories/usd-2020-0041/
• https://github.com/concrete5/concrete5/pull/8713
• https://github.com/concrete5/concrete5/releases/tag/8.5.3
• https://herolab.usd.de/security-advisories/
• https://herolab.usd.de/security-advisories/usd-2020-0041/

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