CVE-2021-36890Network attack vector

Forced privileged actions via forged cross-site requests

Published May 31, 2022 · Updated Apr 28, 2026

Cross-site request forgery in Social Share Buttons by Supsystic 2.2.2 and earlier allows remote attackers to force privileged actions. Patchstack has not identified the affected endpoint or the missing request-validation operation beyond classifying the flaw as CSRF. Exploitation requires a privileged WordPress user to visit a crafted page or click a malicious link, and the bounded reported impact is an unwanted action under that user's session.

CVSS severity4.3
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Social Share Buttons by Supsystic 2.2.2 and earlier allows remote attackers to force privileged actions. Patchstack has not identified the affected endpoint or the missing request-validation operation beyond classifying the flaw as CSRF. Exploitation requires a privileged WordPress user to visit a crafted page or click a malicious link, and the bounded reported impact is an unwanted action under that user's session.

The record

CVE
CVE-2021-36890
Published
May 31, 2022
Updated
Apr 28, 2026
Vendor
Supsystic
Product
Social Share Buttons by Supsystic
Classifications
CWE-352, CAPEC-62
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 31, 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=<= 2.2.2 <=2.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Supsystic · Social Share Buttons by Supsysticversion=<= 2.2.2 <=2.2.2

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
4.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery

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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