CVE-2026-77871 Post Snippets <= 4.2.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-77871?
CVE-2026-77871 is a medium-severity vulnerability in saadiqbal Post Snippets – Custom WordPress Code Snippets Customizer, published on 28 Oct 2026.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-77871?
How do I fix CVE-2026-77871?
No fix has been published for CVE-2026-77871 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-77871 being exploited?
There is no known exploitation of CVE-2026-77871 in the wild and no public exploit code.
Sources
Also known as GHSA-6hh4-5cgj-w743.