CVE-2021-36839Network attack vector

Stored script execution via undisclosed input handling

Published Sep 30, 2022 · Updated Apr 28, 2026

Stored cross-site scripting in Space X-Chimp Social Media Follow Buttons Bar 4.73 and earlier allows remote authenticated users to run script. Patchstack has not published the affected setting, parameter, or code path that stores and renders unneutralized input. Administrator privileges are required to store the payload, and another user's interaction executes it in that user's browser context.

CVSS severity4.8
Medium
EPSS probability0.44%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Space X-Chimp Social Media Follow Buttons Bar 4.73 and earlier allows remote authenticated users to run script. Patchstack has not published the affected setting, parameter, or code path that stores and renders unneutralized input. Administrator privileges are required to store the payload, and another user's interaction executes it in that user's browser context.

The record

CVE
CVE-2021-36839
Published
Sep 30, 2022
Updated
Apr 28, 2026
Vendor
Space X-Chimp
Product
Social Media Follow Buttons Bar
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 30, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=<= 4.73 <=4.73

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Space X-Chimp · Social Media Follow Buttons Barversion=<= 4.73 <=4.73

Published CVSS scores

4.8PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/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 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 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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