What is the CVSS score of CVE-2021-47819?

CVE-2021-47819 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of PHP are affected by CVE-2021-47819?

Organizations using ProjeQtOr Project Management 9.1.4 face critical risk from CVE-2021-47819, a unrestricted file upload vulnerability rated CVSS 9.8.

Is there a public PoC exploit available for CVE-2021-47819?

Yes, a public proof-of-concept exploit is available for CVE-2021-47819. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2021-47819?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Review file handling controls and restrict upload directories.

PHP CVE-2021-47819

CRITICAL

Unrestricted Upload of File with Dangerous Type (CWE-434)

2026-01-15 disclosure@vulncheck.com

PHP

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 16, 2026 - 15:55 vuln.today

Public exploit code

CVE Published

Jan 15, 2026 - 16:16 nvd

CRITICAL 9.8

DescriptionCVE.org

ProjeQtOr Project Management 9.1.4 contains a file upload vulnerability that allows guest users to upload malicious PHP files with arbitrary code execution capabilities. Attackers can upload a PHP script through the profile attachment section and execute system commands by accessing the uploaded file with a specially crafted request parameter.

AnalysisAI

ProjeQtOr Project Management 9.1.4 allows guest users to upload PHP files through profile attachments. Unauthenticated RCE via web shell. PoC available.