CVE-2026-27537 MEDIUM

CVE-2026-27537: WordPress Popup by Supsystic plugin <= 1.11.2 - Cross Site Scripting (XSS) vulnerability

Vendor Supsystic

Product Popup by Supsystic

Weakness CWE-79 · XSS

Published August 13, 2026

Last update August 13, 2026

View on NVD All CVEs

CVSS base score

6.5/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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

Explanation of Vulnerability in Simple Terms

02Summary

Popup by Supsystic versions up to 1.11.2 contain a stored cross-site scripting (XSS) vulnerability. An authenticated user with low privileges can inject malicious scripts that execute in the browsers of other site visitors. The vulnerability requires user interaction to trigger and can affect multiple users across the site.

What an attacker can do

03Attacker Capabilities

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

Potential impact on your site

04Site Impact

Attackers with contributor-level access or higher can deface content, steal visitor data, or redirect users to malicious sites.

Conditions required to exploit

05Prerequisites

Attacker must have a low-privilege account on the site; victim must visit a page containing the injected payload.

Key dates

06Disclosure timeline

August 13, 2026 CVE published

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-27537 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html AskarLabs — CWE-79 write-up Cross-Site Scripting

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