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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 BetterLinks是WordPress基金会开源的一款可生成与优化短链接的插件。 WordPress BetterLinks 3.1.0及之前版本存在授权问题漏洞，该漏洞源于未正确验证用户是否被授权执行操作，导致授权绕过，可能使具有订阅者级别及以上访问权限的已认证攻击者创建任意BetterLinks短URL，实现钓鱼和SEO滥用。

CVSS 4.3 · Medium EPSS 0.29% · P20

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
Vulnerability Title
WordPress BetterLinks 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress BetterLinks是WordPress基金会开源的一款可生成与优化短链接的插件。 WordPress BetterLinks 3.1.0及之前版本存在授权问题漏洞，该漏洞源于未正确验证用户是否被授权执行操作，导致授权绕过，可能使具有订阅者级别及以上访问权限的已认证攻击者创建任意BetterLinks短URL，实现钓鱼和SEO滥用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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