How severe is CVE-2021-40492?

CVE-2021-40492 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-40492 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40492?

CVE-2021-40492 affects Gibbonedu Gibbon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40492?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40492 published?

CVE-2021-40492 was published on 2021-09-03 and last updated on 2026-06-17.

CVE-2021-40492

CVE-2021-40492 is a medium-severity vulnerability in Gibbonedu Gibbon with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Gibbonedu Gibbon
Published: 2021-09-03
Last modified: 2026-06-17

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).

Frequently asked questions

What is CVE-2021-40492?: 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).
How severe is CVE-2021-40492?: CVE-2021-40492 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-40492 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40492?: CVE-2021-40492 affects Gibbonedu Gibbon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40492?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40492 published?: CVE-2021-40492 was published on 2021-09-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gibbonedu:gibbon:22.0.00:*:*:*:*:*:*:*

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