CVE-2021-40102 Deserialization in n/a
Attackers can delete arbitrary files in Concrete CMS via PHAR deserialization in the is_dir function, potentially compromising data integrity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-40102?
CVE-2021-40102 is a critical unsafe deserialization vulnerability in Concretecms Concrete Cms, published on 24 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Concrete CMS through 8.5.5. Arbitrary File deletion can occur via PHAR deserialization in is_dir (PHP Object Injection associated with the __wakeup magic method).
Weakness: CWE-502
Which versions are affected by CVE-2021-40102?
It affects 1 product.
Products include Concretecms Concrete Cms.
How do I fix CVE-2021-40102?
No fix has been published for CVE-2021-40102 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2021-40102 being exploited?
There is no known exploitation of CVE-2021-40102 in the wild and no public exploit code.
Other vulnerabilities in Concretecms Concrete Cms
- CVE-2023-48648 Concrete CMS allows unauthorized access because directories can be created with insecure permissions
- CVE-2022-21829 Code injection in concrete CMS
- CVE-2021-22958 Server-Side Request Forgery vulnerability in concrete5
- CVE-2021-40098 Path traversal in n/a
- CVE-2026-8134 Concrete CMS Vulnerable to Relative Path Traversal
Sources
Also known as GHSA-jgcw-5vw9-7w3c.