How severe is CVE-2021-38710?

CVE-2021-38710 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-2021-38710 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38710?

CVE-2021-38710 affects Yclas. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38710?

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

When was CVE-2021-38710 published?

CVE-2021-38710 was published on 2021-08-18 and last updated on 2026-06-17.

CVE-2021-38710

CVE-2021-38710 is a medium-severity vulnerability in Yclas 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: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Yclas
Published: 2021-08-18
Last modified: 2026-06-17

Description

Static (Persistent) XSS Vulnerability exists in version 4.3.0 of Yclas when using the install/view/form.php script. An attacker can store XSS in the database through the vulnerable SITE_NAME parameter.

Frequently asked questions

What is CVE-2021-38710?: Static (Persistent) XSS Vulnerability exists in version 4.3.0 of Yclas when using the install/view/form.php script. An attacker can store XSS in the database through the vulnerable SITE_NAME parameter.
How severe is CVE-2021-38710?: CVE-2021-38710 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-2021-38710 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38710?: CVE-2021-38710 affects Yclas. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38710?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-38710 published?: CVE-2021-38710 was published on 2021-08-18 and last updated on 2026-06-17.

References

https://github.com/security-n/CVE-2021-38710

Affected products (1)

cpe:2.3:a:yclas:yclas:4.3.0:*:*:*:*:*:*:*

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