CVE-2021-40492

Name: CVE-2021-40492
Creator: NVD / NIST
Published: 2021-09-03T17:15:07.693+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 2.28%

Last modified Jun 17, 2026

CVE-2021-40492 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A reflected XSS vulnerability exists in multiple pages in version 22 of the Gibbon application that allows for arbitrary execution of JavaScript (gibbonCourseClassID, gibbonPersonID, subpage, currentDate, or allStudents to index.php).. EPSS estimates a 2.28% chance of exploitation in the next 30 days.

Description

A reflected XSS vulnerability exists in multiple pages in version 22 of the Gibbon application that allows for arbitrary execution of JavaScript (gibbonCourseClassID, gibbonPersonID, subpage, currentDate, or allStudents to index.php).

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

2.28%

80.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Gibbonedu	Gibbon	22.0.00

References

https://gibbonedu.org/Vendor Advisory
https://github.com/5qu1n7/CVE-2021-40492Third Party Advisory
https://gibbonedu.org/Vendor Advisory
https://github.com/5qu1n7/CVE-2021-40492Third Party Advisory

Timeline

Published: Sep 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40492?

How severe is CVE-2021-40492?

CVE-2021-40492 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 2.28% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40492?

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-2021-40492?

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

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Source: NVD / NIST