CVE-2021-36873 MEDIUM

CVE-2021-36873: WordPress iQ Block Country plugin <= 1.2.11 - Authenticated Persistent Cross-Site Scripting (XSS) vulnerability

Vendor Webence

Product iQ Block Country

Weakness CWE-79 · XSS

Published September 23, 2021

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

5.5/10

Attack vector Network

Attack complexity Low

Privileges required High

User interaction None

Confidentiality Low

Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

Authenticated Persistent Cross-Site Scripting (XSS) vulnerability in WordPress iQ Block Country plugin (versions <= 1.2.11). Vulnerable parameter: &blockcountry_blockmessage.

Explanation of Vulnerability in Simple Terms

02Summary

iQ Block Country version 1.2.11 contains a cross-site scripting (XSS) vulnerability that allows administrators to inject malicious scripts. The vulnerability affects the scope beyond the vulnerable component itself. An attacker with high-level privileges can craft input that executes in other users' browsers, potentially compromising site security or user data.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that execute in other users' browsers when they view affected pages.

Potential impact on your site

04Site Impact

A compromised admin account could inject scripts affecting all site visitors, potentially stealing credentials or modifying site content.

Conditions required to exploit

05Prerequisites

Attacker must have high-level administrative privileges on the site; no user interaction required.

Key dates

06Disclosure timeline

September 23, 2021 CVE published

April 28, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2021-36873 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html AskarLabs — CWE-79 write-up Cross-Site Scripting

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