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Popup by Supsystic <= 1.10.4 — Reflected Cross-Site Scripting

CVE-2021-24275Published · Updated

Action summary

Affected: ≤1.10.4Update to 1.10.5 or newer

All remediation steps
Watch plugin
Severity
Medium6.1
CVSS
6.1
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:R User interaction
Required
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-79 Cross-Site Scripting
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Customer Engagement System – Popup Builder, Forms, CRM & Email Marketing Automation popup-by-supsystic

  1. Affected≤ 1.10.4
  2. Patched in1.10.5

Update to 1.10.5 or newer.

You are affected if you run ≤ 1.10.4. Version 1.10.5 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Customer Engagement System – Popup Builder, Forms, CRM & Email Marketing Automation.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 1.10.5, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Customer Engagement System – Popup Builder, Forms, CRM & Email Marketing Automation to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to 0xB9.

The Popup by Supsystic WordPress plugin before 1.10.5 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Customer Engagement System – Popup Builder, Forms, CRM & Email Marketing Automation

All 17
More vulnerabilities in Customer Engagement System – Popup Builder, Forms, CRM & Email Marketing Automation
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Server-Side Request Forgery
<2.0.2Update to 2.0.2
CVE-2026-115225
High7.2Authenticated (Administrator+) Remote Code Execution
<2.0.2Update to 2.0.2
CVE-2026-115223
Medium4.9Authenticated (Administrator+) SQL Injection
<2.0.2Update to 2.0.2
CVE-2026-115224
Medium4.9Authenticated (Administrator+) SQL Injection via 'sidx' Parameter
≤1.13.2Update to 1.13.3
CVE-2026-104023
High7.2Unauthenticated Stored Cross-Site Scripting
≤1.13.1Update to 1.13.2
CVE-2026-102398

Same weakness (Cross-Site Scripting)

All Cross-Site Scripting
Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity medium, CVSS 6.1

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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