BetterLinks <= 3.1.0 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Short URL Creation via create_fbs_link AJAX Action

Wordfence Intelligence   >   Vulnerability Database   >   BetterLinks <= 3.1.0 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Short URL Creation via create_fbs_link AJAX Action
4.3
Missing Authorization
CVE CVE-2026-19801
CVSS 4.3 (Medium)
Publicly Published August 24, 2026
Last Updated August 25, 2026
Researcher Wordfence PRISM - Wordfence

Description

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.

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Vulnerability Details for BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP

BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP

Software Type Plugin
Software Slug betterlinks (view on wordpress.org)
Patched? Yes
Remediation Update to version 3.1.1, or a newer patched version
Affected Version
  • <= 3.1.0
Patched Version
  • 3.1.1

Recent vulnerabilities in BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP

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BetterLinks – Shorten, Track and Manage any URL <= 1.2.5 - Stored Cross-Site Scripting
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# Title CVE ID CVSS Researchers Date
1 BetterLinks <= 2.1.7 - Authenticated (Administrator+) SQL Injection CVE-2024-51672 4.9 Marek Mikita November 1, 2024
2 BetterLinks <= 1.6.0 - Improper Authorization to Data Import and Export CVE-2023-45104 6.5 Nguyen Anh Tien October 18, 2023
3 BetterLinks – Shorten, Track and Manage any URL <= 1.2.5 - Stored Cross-Site Scripting CVE-2021-24812 5.4 Huy Nguyen October 20, 2021
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