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Core Web Vitals & PageSpeed Booster <= 1.0.12 — Open Redirect via _wp_http_referer

CVE-2023-35883Published · Updated

Action summary

Affected: ≤1.0.12Update to 1.0.13 or newer

All remediation steps
Watch plugin
Severity
Medium4.7
CVSS
4.7
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/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:N Confidentiality
None
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?

Core Web Vitals & PageSpeed Booster core-web-vitals-pagespeed-booster

  1. Affected≤ 1.0.12
  2. Patched in1.0.13

Update to 1.0.13 or newer.

You are affected if you run ≤ 1.0.12. Version 1.0.13 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Core Web Vitals & PageSpeed Booster.
  • 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 1.0.13, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Core Web Vitals & PageSpeed Booster to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Le Ngoc Anh.

The Core Web Vitals & PageSpeed Booster plugin for WordPress is vulnerable to Open Redirect in versions up to, and including, 1.0.12. This is due to insufficient validation on the redirect url supplied via the _wp_http_referer parameter. This makes it possible for unauthenticated attackers to redirect users to potentially malicious sites if they can successfully trick them into performing an action.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in Core Web Vitals & PageSpeed Booster

All 3
More vulnerabilities in Core Web Vitals & PageSpeed Booster
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting
≤1.0.31Update to 1.0.32
CVE-2026-95528
Medium4.3Missing Authorization
≤1.0.27No patch available
CVE-2025-62144

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 4.7

  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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