CVE-2020-5552Network attack vector

Administrator browser script execution via stored XSS

Published Mar 25, 2020 · Updated Aug 4, 2024

Stored cross-site scripting in keitai-site.net mailform 1.04 allows remote attackers to execute script in an administrator's browser. JVN confirms storage and later administrator-side execution but does not disclose the affected parameter, storage path, or output-rendering operation. Exploitation requires an administrator to access the affected site after the payload is stored, enabling script execution in that privileged browser context.

CVSS severity6.1
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in keitai-site.net mailform 1.04 allows remote attackers to execute script in an administrator's browser. JVN confirms storage and later administrator-side execution but does not disclose the affected parameter, storage path, or output-rendering operation. Exploitation requires an administrator to access the affected site after the payload is stored, enabling script execution in that privileged browser context.

The record

CVE
CVE-2020-5552
Published
Mar 25, 2020
Updated
Aug 4, 2024
Vendor
keitai-site.net
Product
mailform
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2020CVE 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?

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

  1. Affected versionversion=version 1.04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

keitai-site.net · mailformversion=version 1.04

Published CVSS scores

6.1JPCERT/CC and IPACVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.0JPCERT/CC and IPAAV:N/AC:L/Au:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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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