How severe is CVE-2021-38709?

CVE-2021-38709 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-2021-38709 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38709?

CVE-2021-38709 affects Compo Composr Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38709?

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

When was CVE-2021-38709 published?

CVE-2021-38709 was published on 2021-08-16 and last updated on 2026-06-17.

CVE-2021-38709

CVE-2021-38709 is a medium-severity vulnerability in Compo Composr Cms 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% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Compo Composr Cms
Published: 2021-08-16
Last modified: 2026-06-17

Description

In ocProducts Composr CMS before 10.0.38, an attacker can inject JavaScript via the staff_messaging messaging system for XSS.

Frequently asked questions

What is CVE-2021-38709?: In ocProducts Composr CMS before 10.0.38, an attacker can inject JavaScript via the staff_messaging messaging system for XSS.
How severe is CVE-2021-38709?: CVE-2021-38709 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-2021-38709 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38709?: CVE-2021-38709 affects Compo Composr Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38709?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-38709 published?: CVE-2021-38709 was published on 2021-08-16 and last updated on 2026-06-17.

References

https://compo.sr/news/view/announcements/two-new-xss-security.htm

Affected products (1)

cpe:2.3:a:compo:composr_cms:*:*:*:*:*:*:*:*

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