CVE-2021-40651

MEDIUM NUCLEI

OS4Ed OpenSIS Community 8.0 - Info Disclosure

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-40651. PoCs published by Eric Salario. A Nuclei detection template is also available.

AI-analyzed exploit summary This exploit demonstrates a directory traversal vulnerability in OpenSIS 8.0 via the 'modname' parameter in 'Modules.php', allowing unauthorized access to arbitrary files on the server. The PoC requires authentication as a 'Parent' user and uses path traversal sequences to read sensitive files like '/etc/passwd'.

Description

OS4Ed OpenSIS Community 8.0 is vulnerable to a local file inclusion vulnerability in Modules.php (modname parameter), which can disclose arbitrary file from the server's filesystem as long as the application has access to the file.

Exploits (1)

exploitdb WORKING POC
by Eric Salario · textwebappsphp
https://www.exploit-db.com/exploits/50259

This exploit demonstrates a directory traversal vulnerability in OpenSIS 8.0 via the 'modname' parameter in 'Modules.php', allowing unauthorized access to arbitrary files on the server. The PoC requires authentication as a 'Parent' user and uses path traversal sequences to read sensitive files like '/etc/passwd'.

Classification
Working Poc 90%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: OpenSIS 8.0
Auth required
Prerequisites: Valid 'Parent' user credentials · Access to the target application
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Nuclei Templates (1)

OS4Ed OpenSIS Community 8.0 - Local File Inclusion
MEDIUMby ctflearner
Shodan: title:"openSIS" || http.title:"opensis"
FOFA: title="opensis"

References (3)

Core 3
Core References
Exploit, Third Party Advisory x_refsource_misc
https://youtu.be/wFwlbXANRCo
Exploit, Third Party Advisory, VDB Entry x_refsource_misc
https://www.exploit-db.com/exploits/50259

Scores

CVSS v3 6.5
EPSS 0.1842
EPSS Percentile 96.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-22
Status published
Products (1)
os4ed/opensis 8.0
Published Sep 29, 2021
Tracked Since Feb 18, 2026