FKIE_CVE-2026-19801

Vulnerability from fkie_nvd - Published: 2026-08-25 02:16 - Updated: 2026-08-26 16:19
Severity
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
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.
References
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/betterlinks/tags/3.0.0/betterlinks.php#L254
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/betterlinks/tags/3.0.0/includes/Admin/Ajax.php#L180
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/betterlinks/tags/3.0.0/includes/Admin/Ajax.php#L99
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/betterlinks/tags/3.1.0/betterlinks.php#L254
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/betterlinks/tags/3.1.0/includes/Admin/Ajax.php#L180
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/betterlinks/tags/3.1.0/includes/Admin/Ajax.php#L99
security@wordfence.comhttps://plugins.trac.wordpress.org/changeset?reponame=&old=3658390%40betterlinks&new=3658390%40betterlinks
security@wordfence.comhttps://www.wordfence.com/threat-intel/vulnerabilities/id/faf44730-b975-4057-96dc-7284775500f9?source=cve
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "BetterLinks \u2013 Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager \u0026 MCP",
          "vendor": "wpdevteam",
          "versions": [
            {
              "lessThanOrEqual": "3.1.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@wordfence.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The BetterLinks \u2013 Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager \u0026 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."
    }
  ],
  "id": "CVE-2026-19801",
  "lastModified": "2026-08-26T16:19:05.917",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "security@wordfence.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-19801",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-25T18:32:47.984379Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-25T02:16:40.250",
  "references": [
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/betterlinks/tags/3.0.0/betterlinks.php#L254"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/betterlinks/tags/3.0.0/includes/Admin/Ajax.php#L180"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/betterlinks/tags/3.0.0/includes/Admin/Ajax.php#L99"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/betterlinks/tags/3.1.0/betterlinks.php#L254"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/betterlinks/tags/3.1.0/includes/Admin/Ajax.php#L180"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/betterlinks/tags/3.1.0/includes/Admin/Ajax.php#L99"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026old=3658390%40betterlinks\u0026new=3658390%40betterlinks"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/faf44730-b975-4057-96dc-7284775500f9?source=cve"
    }
  ],
  "sourceIdentifier": "security@wordfence.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security@wordfence.com",
      "type": "Secondary"
    }
  ]
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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