CVE-2026-12939 – Newsletters

CVE ID :CVE-2026-12939

Published : July 29, 2026, 2:16 a.m. | 23 minutes ago

Description :The Newsletters Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘link’ attribute of the post_thumbnail (and newsletters_post_thumbnail) shortcodes in versions up to and including 4.15. This is due to insufficient input sanitization and output escaping in the post_thumbnail() method in helpers/shortcode.php, which concatenates the user-controlled $link shortcode attribute directly into an href attribute without esc_url() or esc_attr(). 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.

Severity: 6.4 | MEDIUM

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