CVE-2021-40542

MEDIUM NUCLEI

Opensis-Classic 8.0 - Unauthenticated Cross-Site Scripting via Ajax_url_encode.php link_url Parameter

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-40542 has a Nuclei detection template available — see the Nuclei card below for the Shodan/FOFA recon queries.

Description

Opensis-Classic Version 8.0 is affected by cross-site scripting (XSS). An unauthenticated user can inject and execute JavaScript code through the link_url parameter in Ajax_url_encode.php.

Nuclei Templates (1)

Opensis-Classic 8.0 - Cross-Site Scripting
MEDIUMby alph4byt3
Shodan: http.title:"openSIS" || http.title:"opensis"
FOFA: title="opensis"

References (1)

Core 1
Core References
Exploit, Issue Tracking, Third Party Advisory x_refsource_misc
https://github.com/OS4ED/openSIS-Classic/issues/189

Scores

CVSS v3 6.1
EPSS 0.0300
EPSS Percentile 85.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
os4ed/opensis 8.0
Published Oct 11, 2021
Tracked Since Feb 18, 2026