CVE-2026-19801
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
The BetterLinks plugin for WordPress up to version 3.1.0 has an authorization bypass vulnerability, allowing authenticated attackers with subscriber-level access to create arbitrary short URLs with controlled slugs and redirect destinations. Exploitation requires the Fluent Boards plugin to be active and the nonce to be accessible on frontend pages.
Risk Assessment
Attackers can use this for phishing and SEO abuse, potentially harming the organization's reputation and its users.
Recommendation
Update the BetterLinks plugin to the latest patched version. Additionally, restrict access to the Fluent Boards plugin and monitor short URL creation.
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Original NVD description (English source)
The BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.1.0. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to create arbitrary BetterLinks short URLs with attacker-controlled slugs and redirect destinations, enabling phishing and SEO abuse. Exploitation requires the Fluent Boards companion plugin to be installed and active (so that the FLUENT_BOARDS constant is defined), and is further facilitated by the betterlinks_admin_nonce nonce being emitted on every frontend page via wp_localize_script, making it accessible to any authenticated user.

