CVE-2021-40310

Name: CVE-2021-40310
Creator: NVD / NIST
Published: 2021-09-24T16:15:08.47+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2021-40310 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. OpenSIS Community Edition version 8.0 is affected by a cross-site scripting (XSS) vulnerability in the TakeAttendance.php via the cp_id_miss_attn parameter.. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

Description

OpenSIS Community Edition version 8.0 is affected by a cross-site scripting (XSS) vulnerability in the TakeAttendance.php via the cp_id_miss_attn parameter.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.81%

52.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Os4ed	Opensis	8.0

References

https://github.com/MiSERYYYYY/Vulnerability-Reports-and-Disclosures/blob/main/OpenSIS-Community-8.0.mdExploit, Third Party Advisory
https://github.com/OS4ED/openSIS-ClassicProduct, Third Party Advisory
https://www.youtube.com/watch?v=aPKPUDmmYpcExploit, Third Party Advisory
https://github.com/MiSERYYYYY/Vulnerability-Reports-and-Disclosures/blob/main/OpenSIS-Community-8.0.mdExploit, Third Party Advisory
https://github.com/OS4ED/openSIS-ClassicProduct, Third Party Advisory
https://www.youtube.com/watch?v=aPKPUDmmYpcExploit, Third Party Advisory

Timeline

Published: Sep 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40310?

OpenSIS Community Edition version 8.0 is affected by a cross-site scripting (XSS) vulnerability in the TakeAttendance.php via the cp_id_miss_attn parameter.

How severe is CVE-2021-40310?

CVE-2021-40310 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40310?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40310?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST