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WordPress plugin

WordPress Newsletter Plugin – Noptin < 1.6.5 — Open Redirect

CVE-2021-25033Published · Updated

Action summary

Affected: <1.6.5Update to 1.6.5 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-601 Open Redirect
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Noptin – Newsletter, New Post Notifications & Email Automation newsletter-optin-box

  1. Affected< 1.6.5
  2. Patched in1.6.5

Update to 1.6.5 or newer.

You are affected if you run < 1.6.5. Version 1.6.5 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Noptin – Newsletter, New Post Notifications & Email 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 1.6.5, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Noptin – Newsletter, New Post Notifications & Email Automation to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Trang LKB.

The WordPress Newsletter Plugin WordPress plugin before 1.6.5 does not validate the to parameter before redirecting the user to its given value, leading to an open redirect issue.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in Noptin – Newsletter, New Post Notifications & Email Automation

All 8
More vulnerabilities in Noptin – Newsletter, New Post Notifications & Email Automation
SeverityVulnerabilityCVEPublished
Medium5.9Unauthenticated Local File Inclusion via 'the_template_path' Merge-Tag Attribute via Stored Subscriber first_name
≤4.4.3Update to 4.4.4
CVE-2026-119616
High7.2Unauthenticated Stored Cross-Site Scripting
≤4.4.2Update to 4.4.3
CVE-2026-119468
Medium5.4Unauthenticated Stored Cross-Site Scripting via Subscriber Custom Field via Manage Preferences Form + Campaign Preview noptin_key Pivot
≤4.3.10Update to 4.4.0
CVE-2026-103482
Medium5.3Missing Authorization
<4.3.3Update to 4.3.3
CVE-2026-78146
Medium4.4Authenticated (Administrator+) Stored Cross-Site Scripting
≤3.8.7Update to 4.0.0
CVE-2025-49871

Same weakness (Open Redirect)

All Open Redirect
Other Open Redirect 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. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers
[object Object]. 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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