What is CVE-2021-40542?

CVE-2021-40542 is a medium-severity vulnerability in Os4ed Opensis, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-10-11.

How severe is CVE-2021-40542?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-40542 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Os4ed Opensis

CVE-2021-40542

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.032 (86.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Os4ed Opensis — versions 8.0
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2021-40542?: CVE-2021-40542 is a medium-severity vulnerability in Os4ed Opensis, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-10-11.
How severe is CVE-2021-40542?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-40542 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.