CVE-2020-11476
Unrestricted Uploads in Concrete5
Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.
- Record
CVE-2020-11476- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 9.0 High
AV:N/AC:L/Au:S/C:C/I:C/A:C - Weakness
- CWE-434
- Updated
- 2026-11-02
CVE List No score
Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.
- Record
CVE-2020-11476- Updated
- 2026-11-02
EUVDEUVD-2021-2356 No score
Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.
- Record
EUVD-2021-2356- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-hf9p-9r39-r2h3
Unrestricted Uploads in Concrete5
Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.
- Record
GHSA-hf9p-9r39-r2h3- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
OSV
Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.
- Record
CVE-2020-11476- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-hf9p-9r39-r2h3
Unrestricted Uploads in Concrete5
Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.
- Record
GHSA-hf9p-9r39-r2h3- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
concrete5/concrete5Packagist |
before 8.5.3 | 8.5.3 |
concrete5/concrete5Packagist |
before 8.5.3, plus listed versions 8.08.0.18.0.28.0.38.1.0 Show 19 moreShow less8.2.08.2.0RC28.2.18.3.08.3.18.3.28.4.08.4.0RC38.4.0RC48.4.18.4.28.4.38.4.48.4.58.5.08.5.0RC18.5.0RC28.5.18.5.2 |
8.5.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-11476 is a high vulnerability (CVSS 7.2) in Concretecms Concrete Cms, published July 28, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.94%, the 87th percentile. Fixed in concrete5/concrete5 8.5.3.
References
herolab.usd.de/security-advisories
github.com/concrete5/concrete5/pull/8713
nvd.nist.gov/vuln/detail/CVE-2020-11476