CVE-2026-118784

{
  "id": "CVE-2026-118784",
  "sourceIdentifier": "[email protected]",
  "published": "2026-11-07T10:17:06.970",
  "lastModified": "2026-11-07T10:17:07.107",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The WPSpeed plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.6.10 This is due to a combination of two issues in the LightImages HTML optimizer: (1) Dispatcher::runOptimize() decides whether the current request is the site's home page by comparing only the URL path from REQUEST_URI against the path of the home URL, so on a plain-permalinks install the author archive URL /?author=<ID> is treated as the home page and the LightImages optimizer runs on it; and (2) LightImages::optimize() calls html_entity_decode() across the entire serialized DOMDocument output under the default-enabled img_processing_entity_decode setting, converting any entity-encoded markup present as plain text in the page (including WordPress's rendered author title) into live HTML. This makes it possible for authenticated attackers, with Subscriber-level access and above, to store entity-encoded markup in their own nickname/display_name through the normal profile endpoint and have that markup rehydrated into executing script when any logged-out visitor loads their author archive."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "john-dagelmore",
          "product": "WPSpeed – WordPress Speed, Cache & Performance Optimization (Core Web Vitals, PageSpeed 100)",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "2.6.10",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 2.7
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://plugins.trac.wordpress.org/browser/wpspeed/tags/2.6.10/src/Core/LightImages.php#L628",
      "source": "[email protected]"
    },
    {
      "url": "https://plugins.trac.wordpress.org/browser/wpspeed/tags/2.6.10/src/Core/Optimize.php#L152",
      "source": "[email protected]"
    },
    {
      "url": "https://plugins.trac.wordpress.org/browser/wpspeed/tags/2.6.10/src/Dispatcher.php#L170",
      "source": "[email protected]"
    },
    {
      "url": "https://plugins.trac.wordpress.org/changeset/3771695/wpspeed/trunk/src/Core/LightImages.php",
      "source": "[email protected]"
    },
    {
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/47aa1a74-4189-4521-ba6e-e91a06b8f5a6?source=cve",
      "source": "[email protected]"
    }
  ]
}