CVE-2021-47936 | OpenCATS 0.9.4 contains a remote code execution vulnerabilit… | CVSS 9.8 CRITICAL

Description

OpenCATS 0.9.4 contains a remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary commands by uploading malicious PHP files disguised as resume attachments. Attackers can upload PHP payloads through the careers job application endpoint and execute system commands via POST requests to the uploaded file in the upload directory.

Metadata

CVE ID: CVE-2021-47936
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-02-01 11:24 UTC
Published: 2026-05-10 12:43 UTC
Last updated: 2026-05-11 15:17 UTC
Primary CWE: CWE-306
Missing Authentication for Critical Function
Vendor / Product: Opencats / OpenCATS
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Opencats	OpenCATS	—	0 ≤ 0.9.4

Weakness (CWE)

CWE	Source	Description
CWE-306	cna	Missing Authentication for Critical Function

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3	CRITICAL	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References (4)

ExploitDB-50585 https://www.exploit-db.com/exploits/50585
Official Product Homepage https://www.opencats.org/
Product Reference https://github.com/opencats/OpenCATS
VulnCheck Advisory: OpenCATS 0.9.4 Remote Code Execution via Resume Upload https://www.vulncheck.com/advisories/opencats-remote-code-execution-via-resume-upload