Cyber Posture

CVE-2021-47936

CriticalPublic PoC

Published: 10 May 2026

Published
10 May 2026
Modified
10 May 2026
KEV Added
Patch
CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score N/A
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-47936 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Opencats (inferred from references). Its CVSS base score is 9.8 (Critical).

Operationally, it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Threat & Defense Details

Likely Mitigating ControlsAI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-306

Requires established identification and authentication to unlock, mitigating missing authentication for continued system access.

addresses: CWE-306

Requiring identification and rationale for actions allowed without authentication ensures critical functions are not left unprotected by forcing review of authentication requirements.

addresses: CWE-306

Authorizing mobile device connections to organizational systems ensures authentication is performed for this critical access function.

addresses: CWE-306

Guarantees critical functions are protected by mandatory invocation of the access control mechanism.

addresses: CWE-306

Auditing sessions makes it possible to detect access to critical functions without required authentication.

addresses: CWE-306

The assessment process confirms authentication is present and effective for critical functions, preventing exploitation from missing authentication.

addresses: CWE-306

Certification assesses that critical functions have required authentication controls in place.

addresses: CWE-306

Disabling non-essential functions and services eliminates the need to secure them, reducing exposure from missing authentication on unnecessary components.

NVD 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…

more

via POST requests to the uploaded file in the upload directory.

Deeper analysisAI

Automated synthesis unavailable for this CVE.

Details

CWE(s)

Affected Products

Opencats
inferred from references and description; NVD did not file a CPE for this CVE

CVEs Like This One

CVE-2026-34732Shared CWE-306
CVE-2025-24865Shared CWE-306
CVE-2025-66049Shared CWE-306
CVE-2026-28458Shared CWE-306
CVE-2026-29132Shared CWE-306
CVE-2026-1453Shared CWE-306
CVE-2026-23693Shared CWE-306
CVE-2026-31882Shared CWE-306
CVE-2026-32041Shared CWE-306
CVE-2025-55222Shared CWE-306

References