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CVE-2026-77871

6.4 medium Deferred
NVD · CVE.org

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 <script>...</script> 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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusPublished → DeferredNVD modified 2026-10-28 13:46
  2. StatusReceived → PublishedNVD modified 2026-10-28 06:45
  3. StatusPublished → ReceivedNVD modified 2026-10-28 07:16
  4. First seenCVSS 6.4 · saadiqbalNVD modified 2026-10-28 06:45

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 10