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Vulnerabilities

Vulnerability · CVE-2026-77871

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

Published Oct 28, 2026 · catalog updated Oct 28, 2026 · Post Snippets – Custom WordPress Code Snippets Customizer

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-77871. EPSS is 0.24%. Act only if a listed version of Post Snippets – Custom WordPress Code Snippets Customizer is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.24%
Remediation
Version ranges on file
Affected products
stated Post Snippets – Custom WordPress Code Snippets Customizer · vendor saadiqbal Post Snippets – Custom WordPress Code Snippets Customizer

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 ... 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated Post Snippets – Custom WordPress Code Snippets Customizer<= 4.2.4
  • vendor saadiqbal Post Snippets – Custom WordPress Code Snippets Customizerversion unspecified

How to fix CVE-2026-77871

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-77871. EPSS is 0.24%. Act only if a listed version of Post Snippets – Custom WordPress Code Snippets Customizer is installed.

Which versions are affected?

Compare what you have installed with Post Snippets – Custom WordPress Code Snippets Customizer <= 4.2.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 28, 2026 · CIRCL Vulnerability Lookup

    Detected

    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

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-77871

    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

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-77871

    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

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-77871

    30-day exploitation probability 0.24%

    first.org

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 28, 2026
  • CVE.orgOct 28, 2026
  • CIRCL Vulnerability LookupOct 28, 2026