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CVE-2026-19801— BetterLinks <= 3.1.0 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Short URL Creation via create_fbs_link AJAX Action

Quick assessment

Affected
wpdevteam BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 BetterLinks – Link Shortener、Link Cloaking、Redirects、Affiliate Link Manager & MCP 存在授权绕过漏洞，影响所有包含 3.1.0 在内的版本。该漏洞是由于插件未正确验证用户是否拥有执行某项操作的权限所致。这使得经过身份认证、具有订阅者级别及以上权限的攻击者能够创建任意 BetterLinks 短链接，攻击者可自由控制短链接的“后缀”（slug）和重定向目标，从而实现网络钓鱼和搜索引擎优化（SEO）滥用。 此漏洞的

CVSS 4.3 · Medium EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpdevteam BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP ≤ 3.1.0 affected
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I. Basic Information for CVE-2026-19801

Vulnerability Information
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Vulnerability Title
BetterLinks <= 3.1.0 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Short URL Creation via create_fbs_link AJAX Action
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wpdevteam BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP 0 ~ 3.1.0 -

II. Public POCs for CVE-2026-19801

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III. Intelligence Information for CVE-2026-19801

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Patches & Fixes for CVE-2026-19801 (3)

Vendor Advisories for CVE-2026-19801 (1)

IV. Related Vulnerabilities

Same vendor: wpdevteam
Same weakness: CWE-862

V. Comments for CVE-2026-19801

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