What is CVE-2021-38709?

CVE-2021-38709 is a medium-severity vulnerability in Compo Composr Cms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-08-16.

How severe is CVE-2021-38709?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Compo Composr Cms

CVE-2021-38709

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

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-08-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Compo Composr Cms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

compo.sr/news/view/announcements/two-new-xss-security.htm (Vendor Advisory)

Frequently asked questions

What is CVE-2021-38709?: CVE-2021-38709 is a medium-severity vulnerability in Compo Composr Cms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-08-16.
How severe is CVE-2021-38709?: Medium severity. CVSS v3 base score is 6.1 out of 10.