CVE-2026-19801 json
BetterLinks <= 3.1.0 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Short URL Creation via create_fbs_link AJAX Action
published 2026-08-25 2 mo ago modified 2026-10-12 27 d ago also EUVD-2026-65193
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected products
- wpdevteam BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP
Classification
- Weakness
-
- CWE-862 Missing Authorization
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/faf44730-b975-4057-96dc-7284775500f9?source=cve
- plugins.trac.wordpress.org /browser/betterlinks/tags/3.0.0/includes/Admin/Ajax.php#L180
- plugins.trac.wordpress.org /browser/betterlinks/tags/3.1.0/includes/Admin/Ajax.php#L180
- plugins.trac.wordpress.org /browser/betterlinks/tags/3.1.0/includes/Admin/Ajax.php#L99
- plugins.trac.wordpress.org /browser/betterlinks/tags/3.1.0/betterlinks.php#L254
- plugins.trac.wordpress.org /browser/betterlinks/tags/3.0.0/includes/Admin/Ajax.php#L99
- plugins.trac.wordpress.org /browser/betterlinks/tags/3.0.0/betterlinks.php#L254
- plugins.trac.wordpress.org /changeset?reponame=&old=3658390%40betterlinks&new=3658390%40betterlinks
Sources
- CVE List CVE-2026-19801
- NVD CVE-2026-19801
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.