CVE-2020-20700Public exploitNetwork attack vector

Stored script execution via unescaped form title

Published Jul 27, 2021 · Updated Aug 4, 2024

Stored XSS in the form-management interface of S-CMS PHP 3.0 allows remote authenticated users to execute script in an administrator's browser. The /app/form_add/ workflow stores an unescaped Title Entry value, and the recycle-bin view renders that value as active HTML and JavaScript. Administrator access is required to save the payload, and another visit to the recycle bin triggers code in that visitor's browser context.

CVSS severity4.8
Medium
EPSS probability0.58%
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 the form-management interface of S-CMS PHP 3.0 allows remote authenticated users to execute script in an administrator's browser. The /app/form_add/ workflow stores an unescaped Title Entry value, and the recycle-bin view renders that value as active HTML and JavaScript. Administrator access is required to save the payload, and another visit to the recycle bin triggers code in that visitor's browser context.

The record

CVE
CVE-2020-20700
Published
Jul 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
T1059.007JavaScript/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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