FKIE_CVE-2026-108587

Vulnerability from fkie_nvd - Published: 2026-10-15 05:17 - Updated: 2026-10-15 17:17
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
The 10Web Booster – Website speed optimization, Cache & Page Speed optimizer plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.34.10 via the compressCustom function. This is due to missing file type validation and extension filtering on the page_id parameter, combined with a world-readable leaked nonce that bypasses authentication checks. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. This exploit chain requires obtaining the plugin's REST nonce (tenwebio_rest), which is automatically serialized to a world-readable file under wp-content/uploads/ whenever a bulk optimisation batch pauses; because the nonce is generated in a cron/loopback context with a user ID of 0, it is valid for unauthenticated visitors.
References
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/10web-queue/src/TenWebQueue/Traits/QueueRestart.php#L63
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/CompressService.php#L99
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L310
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L99
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Utils.php#L161
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/10web-queue/src/TenWebQueue/Traits/QueueRestart.php#L63
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/CompressService.php#L99
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L310
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L99
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Utils.php#L161
security@wordfence.comhttps://plugins.trac.wordpress.org/changeset/3743299/tenweb-speed-optimizer
security@wordfence.comhttps://www.wordfence.com/threat-intel/vulnerabilities/id/adfd97cf-8f61-463d-a535-1a61e3c2e134?source=cve
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "10Web Booster \u2013 Website speed optimization, Cache \u0026 Page Speed optimizer",
          "vendor": "10web",
          "versions": [
            {
              "lessThanOrEqual": "2.34.10",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@wordfence.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The 10Web Booster \u2013 Website speed optimization, Cache \u0026 Page Speed optimizer plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.34.10 via the compressCustom function. This is due to missing file type validation and extension filtering on the page_id parameter, combined with a world-readable leaked nonce that bypasses authentication checks. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. This exploit chain requires obtaining the plugin\u0027s REST nonce (tenwebio_rest), which is automatically serialized to a world-readable file under wp-content/uploads/ whenever a bulk optimisation batch pauses; because the nonce is generated in a cron/loopback context with a user ID of 0, it is valid for unauthenticated visitors."
    }
  ],
  "id": "CVE-2026-108587",
  "lastModified": "2026-10-15T17:17:14.450",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security@wordfence.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-108587",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-15T10:45:57.501865Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-15T05:17:02.637",
  "references": [
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/10web-queue/src/TenWebQueue/Traits/QueueRestart.php#L63"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/CompressService.php#L99"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L310"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L99"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Utils.php#L161"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/10web-queue/src/TenWebQueue/Traits/QueueRestart.php#L63"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/CompressService.php#L99"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L310"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L99"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Utils.php#L161"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/changeset/3743299/tenweb-speed-optimizer"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/adfd97cf-8f61-463d-a535-1a61e3c2e134?source=cve"
    }
  ],
  "sourceIdentifier": "security@wordfence.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ],
      "source": "security@wordfence.com",
      "type": "Secondary"
    }
  ]
}



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