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Newsletters <= 4.6.8.5 — Object Injection

CVE-2018-20987Published · Updated

Action summary

Affected: <4.6.8.6Update to 4.6.8.6 or newer

All remediation steps
Watch plugin
Severity
Critical9.8
CVSS
9.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-502 PHP Object Injection
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Newsletters newsletters-lite

  1. Affected< 4.6.8.6
  2. Patched in4.6.8.6

Update to 4.6.8.6 or newer.

You are affected if you run < 4.6.8.6. Version 4.6.8.6 and later are not affected by this issue.

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

Advisory

Source description from Wordfence Intelligence.

The newsletters-lite plugin before 4.6.8.6 for WordPress has PHP object injection.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in Newsletters

All 46
More vulnerabilities in Newsletters
SeverityVulnerabilityCVEPublished
Medium6.5Authenticated (Subscriber+) SQL Injection via 'user_email' User Meta
≤4.18.2Update to 4.18.3
CVE-2026-122063
Medium5.3Authenticated (Subscriber+) SQL Injection via 'id' Parameter
≤4.18.1Update to 4.18.2
CVE-2026-101325
Medium4.3Cross-Site Request Forgery
≤4.18.2No patch available
CVE-2026-116863
High8.1Unauthenticated PHP Object Injection
≤4.18.1Update to 4.18.2
CVE-2026-94075
High7.5Unauthenticated SQL Injection
≤4.18.1Update to 4.18.2
CVE-2026-111402

Same weakness (PHP Object Injection)

All PHP Object Injection
Other PHP Object Injection 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 critical, CVSS 9.8

  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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