CVE-2021-36893Network attack vector

Browser script execution via undisclosed stored input

Published Apr 11, 2022 · Updated Apr 28, 2026

Stored cross-site scripting in WP Darko Responsive Tabs 4.0.5 and earlier allows remote authenticated users to run script in a visitor's browser. The CNA and vendor references do not identify the affected field or the missing neutralization step that permits stored input to reach page output. Author-level access or higher is required to store the payload, and another user must view the affected content, exposing that browser session to attacker-controlled actions.

CVSS severity4.8
Medium
EPSS probability0.60%
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 WP Darko Responsive Tabs 4.0.5 and earlier allows remote authenticated users to run script in a visitor's browser. The CNA and vendor references do not identify the affected field or the missing neutralization step that permits stored input to reach page output. Author-level access or higher is required to store the payload, and another user must view the affected content, exposing that browser session to attacker-controlled actions.

The record

CVE
CVE-2021-36893
Published
Apr 11, 2022
Updated
Apr 28, 2026
Vendor
WP Darko
Product
Responsive Tabs
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 11, 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=<= 4.0.5 <=4.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WP Darko · Responsive Tabsversion=<= 4.0.5 <=4.0.5

Published CVSS scores

4.8PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV: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
Privilegesauthenticated
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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