Composr CMS 10.0.34 contains a persistent cross-site scripting vulnerability that allows authenticated administrators to inject malicious scripts through the banner management interface. Attackers with admin credentials can inject XSS payloads in the Description field of the Add banner functionality, which execute for all website visitors when they access the home page.
CVE-2020-37237
MEDIUMNVD 6.46.4—
EchelonGraph scoreHIGH confidence
Score 6.4 from GitHub Security Advisory published 2026-05-16. NVD baseline CVSS 6.4; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.4
- CVSS v3
- 6.4
- EG Score
- 6.4(high)
- EPSS
- 10.2%
- KEV
- Not listed
Published
May 16, 2026
Last Modified
May 18, 2026
References (4)
- disclosure@vulncheckhttps://compo.sr/
- disclosure@vulncheckhttps://compo.sr/download.htm
- disclosure@vulncheckhttps://www.exploit-db.com/exploits/49190
- disclosure@vulncheckhttps://www.vulncheck.com/advisories/composr-cms-persistent-cross-site-scripting-via-banners
Frequently asked(5)
What is CVE-2020-37237?
CVE-2020-37237 is a medium vulnerability published on May 16, 2026. Composr CMS 10.0.34 contains a persistent cross-site scripting vulnerability that allows authenticated administrators to inject malicious scripts through the banner management interface. Attackers with admin credentials can inject XSS payloads in the Description field of the Add banner…
When was CVE-2020-37237 disclosed?
CVE-2020-37237 was first published in the National Vulnerability Database on May 16, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-37237 actively exploited?
CVE-2020-37237 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-37237?
CVE-2020-37237 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2020-37237?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-37237, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-37237
Is Your Infrastructure Affected by CVE-2020-37237?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.