CVE-2020-37237Public exploitNetwork attack vector

Visitor script execution via stored banner description

Published May 16, 2026 · Updated May 16, 2026

Stored XSS in Composr CMS 10.0.34 allows remote authenticated users to execute scripts in visitors' browsers through banner descriptions. The report says the Add banner interface stores an administrator-supplied Description value and renders it on the home page without neutralizing script markup. Administrator access is required, and Composr disputes the finding as unreproducible.

CVSS severity5.1
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Composr CMS 10.0.34 allows remote authenticated users to execute scripts in visitors' browsers through banner descriptions. The report says the Add banner interface stores an administrator-supplied Description value and renders it on the home page without neutralizing script markup. Administrator access is required, and Composr disputes the finding as unreproducible.

The record

CVE
CVE-2020-37237
Published
May 16, 2026
Updated
May 16, 2026
Vendor
Composr
Product
Composr CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 16, 2026CVE publishedPublication date reported by the CVE source.
  2. May 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.34

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Composr · Composr CMSversion=10.0.34

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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