PT-2026-39511 · Opencats · Opencats

Published 2026-05-10 · Updated 2026-05-10 · CVE-2021-47936

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions OpenCATS version 0.9.4

Description Unauthenticated attackers can execute arbitrary commands by uploading malicious PHP files disguised as resume attachments. This is achieved by uploading PHP payloads through the 'careers job application' endpoint and executing system commands via POST requests to the uploaded file within the upload directory.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

Missing Authentication

Weakness Enumeration

CWE-306

Related Identifiers

CVE-2021-47936

Affected Products

Opencats

References · 6

• 🔥 https://exploit-db.com/exploits/50585 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-47936 · Security Note
• https://github.com/opencats/OpenCATS · Note
• https://twitter.com/CVEnew/status/2053537429366432027 · Twitter Post
• https://opencats.org · Note
• https://vulncheck.com/advisories/opencats-remote-code-execution-via-resume-upload · Note