CVE-2021-40940
Monstra 3.0.4 does not filter the case of php, which leads to an unrestricted file upload...
Monstra 3.0.4 does not filter the case of php, which leads to an unrestricted file upload vulnerability.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Monstra 3.0.4 does not filter the case of php, which leads to an unrestricted file upload vulnerability.
- Record
CVE-2021-40940- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-434
- Updated
- 2026-11-02
CVE List No score
Monstra 3.0.4 does not filter the case of php, which leads to an unrestricted file upload vulnerability.
- Record
CVE-2021-40940- Updated
- 2026-11-02
EUVDEUVD-2021-28094 No score
Monstra 3.0.4 does not filter the case of php, which leads to an unrestricted file upload vulnerability.
- Record
EUVD-2021-28094- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-rf4j-5wqh-fgfx
Monstra 3.0.4 does not filter the case of php, which leads to an unrestricted file upload...
Monstra 3.0.4 does not filter the case of php, which leads to an unrestricted file upload vulnerability.
- Record
GHSA-rf4j-5wqh-fgfx- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
OSV
Monstra 3.0.4 does not filter the case of php, which leads to an unrestricted file upload vulnerability.
- Record
CVE-2021-40940- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
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-2021-40940 is a critical vulnerability (CVSS 9.8) in Monstra, published June 15, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.66%, the 76th percentile. No source names a fixed version.