CVE-2020-11476 Unrestricted Uploads in Concrete5
High 7.2
Published
Updated
Check this codebase for CVE-2020-11476 and fix it if it is affected.
What it is: CVE-2020-11476 is a high-severity vulnerability in Concretecms Concrete Cms, published on 28 Jul 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-11476 in the wild and no public exploit code.
Affected packages and fixed versions:
- concrete5/concrete5 (Packagist): affected all versions; fixed in 8.5.3
- concrete5/concrete5 (Packagist): affected all versions; fixed in 8.5.3
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2020-11476/ (Markdown: https://insights.sbomify.com/CVE-2020-11476/index.md)
Attackers can upload dangerous files like .phar to execute arbitrary code on Concrete5 CMS installations.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-11476?
CVE-2020-11476 is a high-severity vulnerability in Concretecms Concrete Cms, published on 28 Jul 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.
Weakness: CWE-434
Which versions are affected by CVE-2020-11476?
2 open source packages ship an affected version, including concrete5/concrete5. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
concrete5/concrete5 Packagist | All versions | 8.5.3 |
concrete5/concrete5 Packagist | All versions | 8.5.3 |
Products include Concretecms Concrete Cms.
How do I fix CVE-2020-11476?
Upgrade concrete5/concrete5 to 8.5.3 or later.
Is CVE-2020-11476 being exploited?
There is no known exploitation of CVE-2020-11476 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-hf9p-9r39-r2h3.