CVE-2026-120551

Full vulnerability record from the local CVENow database.

Description

The WP Compress – Instant Performance & Speed Optimization plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 7.22.01. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to link the victim site to an attacker-controlled WP Compress account, overwrite plugin settings to an aggressive live-CDN preset, and gain the shared api_key that authenticates all nopriv HMAC-gated endpoints — enabling full control over cache purging, file deletion, opcode cache invalidation, and other privileged plugin operations. This vulnerability only affects fresh installations or lite/free-mode installs where no api_key is already stored, as the sole guard fails open when the stored key is absent.

Severity

MEDIUM

CVSS score

5.3 (v3.1)

Vulnerability status

Deferred

Source identifier

[email protected]

Published

2026-11-03 05:18:32.637000

Last modified

2026-11-03 05:18:32.790000

View original CVE JSON

{
  "id": "CVE-2026-120551",
  "sourceIdentifier": "[email protected]",
  "published": "2026-11-03T05:18:32.637",
  "lastModified": "2026-11-03T05:18:32.790",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The WP Compress – Instant Performance & Speed Optimization plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 7.22.01. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to link the victim site to an attacker-controlled WP Compress account, overwrite plugin settings to an aggressive live-CDN preset, and gain the shared api_key that authenticates all nopriv HMAC-gated endpoints — enabling full control over cache purging, file deletion, opcode cache invalidation, and other privileged plugin operations. This vulnerability only affects fresh installations or lite/free-mode installs where no api_key is already stored, as the sole guard fails open when the stored key is absent."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "aresit",
          "product": "WP Compress – Instant Performance & Speed Optimization",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "7.22.01",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://plugins.trac.wordpress.org/browser/wp-compress-image-optimizer/tags/7.21.27/classes/connect.class.php#L103",
      "source": "[email protected]"
    },
    {
      "url": "https://plugins.trac.wordpress.org/browser/wp-compress-image-optimizer/tags/7.21.27/classes/mainwp.class.php#L29",
      "source": "[email protected]"
    },
    {
      "url": "https://plugins.trac.wordpress.org/browser/wp-compress-image-optimizer/tags/7.21.27/classes/mainwp.class.php#L9",
      "source": "[email protected]"
    },
    {
      "url": "https://plugins.trac.wordpress.org/changeset?reponame=&old=3680035%40wp-compress-image-optimizer&new=3680035%40wp-compress-image-optimizer",
      "source": "[email protected]"
    },
    {
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/42d4ec8b-d3ed-4aa3-a8b9-cddaf64a7531?source=cve",
      "source": "[email protected]"
    }
  ]
}