XSS in Os4ed Opensis

CVE-2021-27340

OpenSIS Community Edition version <= 7.6 is affected by a reflected XSS vulnerability in EmailCheck.php via the "opt" parameter.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.011 (62.9th 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
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC, Issue Tracking)
cve@mitre.org (Third Party Advisory, x_refsource_MISC, Release Notes)
cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-27340?: CVE-2021-27340 is a medium-severity vulnerability in Os4ed Opensis, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-09-16.
How severe is CVE-2021-27340?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-27340 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.