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Post Snippets <= 4.2.4 — Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

CVE-2026-77871Published · Updated

Action summary

Affected: ≤4.2.4Update to 4.2.5 or newer

All remediation steps
Watch plugin
Severity
Medium6.4
CVSS
6.4
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:L Privileges required
Low
UI:N User interaction
None
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-79 Cross-Site Scripting
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Post Snippets – Custom WordPress Code Snippets Customizer post-snippets

  1. Affected≤ 4.2.4
  2. Patched in4.2.5

Update to 4.2.5 or newer.

You are affected if you run ≤ 4.2.4. Version 4.2.5 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Post Snippets – Custom WordPress Code Snippets Customizer.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 4.2.5, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Post Snippets – Custom WordPress Code Snippets Customizer to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Wordfence PRISM.

The Post Snippets – Custom WordPress Code Snippets Customizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 4.2.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Entity-encoded payloads such as &lt;script&gt;...&lt;/script&gt; survive WordPress's wp_kses_post on-save sanitization because kses does not decode HTML entities, and are only converted back into executable HTML tags at render time by the plugin's own shortcode filter. This requires snippet shortcodes to be enabled.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in Post Snippets – Custom WordPress Code Snippets Customizer

All 11
More vulnerabilities in Post Snippets – Custom WordPress Code Snippets Customizer
SeverityVulnerabilityCVEPublished
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤4.2.4No patch available
CVE-2026-12980
High8.8Authenticated (Contributor+) Remote Code Execution
≤4.0.19Update to 4.1.0
CVE-2026-56049
Medium4.4Authenticated (Administrator+) Stored Cross-Site Scripting via Import
≤4.0.19Update to 4.1.1
CVE-2026-7430
High8.8Authenticated (Contributor+) Remote Code Execution
≤4.0.12Update to 4.0.13
CVE-2026-25001
Medium4.3Cross-Site Request Forgery
≤4.0.11Update to 4.0.12
CVE-2025-63040

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 6.4

  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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