CVE-2021-20688Network attack vector

Browser script execution via stored page-ranking content

Published Apr 7, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in GoPlace! Click Ranker 3.5 allows remote attackers to execute arbitrary script in visitors' browsers. The page-ranking screen stores attacker-supplied content and later renders it without neutralization, causing script execution when a user opens the screen. No authentication is required, but exploitation requires a user to visit the affected page; the demonstrated consequence is script execution in that browser.

CVSS severity6.1
Medium
EPSS probability0.76%
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 GoPlace! Click Ranker 3.5 allows remote attackers to execute arbitrary script in visitors' browsers. The page-ranking screen stores attacker-supplied content and later renders it without neutralization, causing script execution when a user opens the screen. No authentication is required, but exploitation requires a user to visit the affected page; the demonstrated consequence is script execution in that browser.

The record

CVE
CVE-2021-20688
Published
Apr 7, 2021
Updated
Aug 3, 2024
Vendor
GoPlace!
Product
Click Ranker
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Ver.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GoPlace! · Click Rankerversion=Ver.3.5

Published CVSS scores

6.1JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.0JPCERT/CCAV: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
T1059.007Command and Scripting Interpreter: JavaScript/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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