CVE-2026-27537
Received Received - Intake

Unauthenticated XSS in Popup by Supsystic

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: Patchstack

Description
Unauthenticated Cross Site Scripting (XSS) in Popup by Supsystic <= 1.11.2 versions.

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-27537
EUVD
EUVD-2026-57935

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
supsystic popup to 1.11.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability found in Popup by Supsystic plugin versions 1.11.2 and below. It allows attackers to inject malicious scripts into web pages viewed by users without needing authentication.

Detection Guidance

To detect this vulnerability, check if you are running Popup by Supsystic version 1.11.2 or earlier. Inspect web pages for unsanitized user input that could execute scripts. Manually review plugin files for XSS vectors in input fields or parameters.

Impact Analysis

An attacker could exploit this to steal user sessions, deface websites, or redirect users to malicious sites. Users with access to the plugin could also modify its behavior or inject further malicious code.

Compliance Impact

This XSS vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection requirements and HIPAA's security rules for protected health information.

Mitigation Strategies

Immediately update Popup by Supsystic to the latest version beyond 1.11.2. If an update is unavailable, disable or remove the plugin. Implement input validation and output encoding on all user-supplied data. Monitor for unusual activity or script execution.

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