CVE-2026-15446 (GCVE-0-2026-15446)

Vulnerability from cvelistv5 – Published: 2026-08-19 06:37 – Updated: 2026-08-19 06:37
VLAI
Title
EWWW Image Optimizer <= 8.7.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'data-script' Lazy Load Attribute in Post Content
Summary
The EWWW Image Optimizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'data-script' Lazy Load Attribute in Post Content in all versions up to, and including, 8.7.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit is achieved by embedding a crafted img element with class='lazyload' and a data-script attribute pointing to an attacker-controlled URL in post content, which the plugin's bundled lazysizes ls.unveilhooks addon then uses to dynamically create and insert a script element into the DOM at page view time.
Severity
6.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version CPE status
nosilver4u EWWW Image Optimizer Affected: 0 , ≤ 8.7.3 (semver)
guessed Create a notification for this product.
Credits
UKO
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "EWWW Image Optimizer",
          "vendor": "nosilver4u",
          "versions": [
            {
              "lessThanOrEqual": "8.7.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "UKO"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The EWWW Image Optimizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via \u0027data-script\u0027 Lazy Load Attribute in Post Content in all versions up to, and including, 8.7.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit is achieved by embedding a crafted img element with class=\u0027lazyload\u0027 and a data-script attribute pointing to an attacker-controlled URL in post content, which the plugin\u0027s bundled lazysizes ls.unveilhooks addon then uses to dynamically create and insert a script element into the DOM at page view time."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T06:37:54.690Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/e8af1fdb-7fec-4bbe-937b-ee2e76cf5c5b?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/includes/ls.unveilhooks.js#L116"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/includes/ls.unveilhooks.js#L178"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/classes/class-lazy-load.php#L1679"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/classes/class-lazy-load.php#L496"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/includes/ls.unveilhooks.js#L116"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/includes/ls.unveilhooks.js#L178"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/classes/class-lazy-load.php#L1679"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/classes/class-lazy-load.php#L496"
        },
        {
          "url": "https://github.com/nosilver4u/ewww-image-optimizer/commit/4488aafaee9212db370a5ed2dcb9bad7912b897d"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-07-10T20:26:32.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-08-18T17:52:25.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "EWWW Image Optimizer \u003c= 8.7.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via \u0027data-script\u0027 Lazy Load Attribute in Post Content"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-15446",
    "datePublished": "2026-08-19T06:37:54.690Z",
    "dateReserved": "2026-07-10T19:15:03.406Z",
    "dateUpdated": "2026-08-19T06:37:54.690Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-15446",
      "date": "2026-08-19",
      "epss": "0.00241",
      "percentile": "0.1554"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-15446\",\"sourceIdentifier\":\"security@wordfence.com\",\"published\":\"2026-08-19T07:16:27.530\",\"lastModified\":\"2026-08-19T07:16:27.530\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The EWWW Image Optimizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via \u0027data-script\u0027 Lazy Load Attribute in Post Content in all versions up to, and including, 8.7.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit is achieved by embedding a crafted img element with class=\u0027lazyload\u0027 and a data-script attribute pointing to an attacker-controlled URL in post content, which the plugin\u0027s bundled lazysizes ls.unveilhooks addon then uses to dynamically create and insert a script element into the DOM at page view time.\"}],\"affected\":[{\"source\":\"security@wordfence.com\",\"affectedData\":[{\"vendor\":\"nosilver4u\",\"product\":\"EWWW Image Optimizer\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"8.7.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@wordfence.com\",\"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\":\"security@wordfence.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-79\"}]}],\"references\":[{\"url\":\"https://github.com/nosilver4u/ewww-image-optimizer/commit/4488aafaee9212db370a5ed2dcb9bad7912b897d\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/classes/class-lazy-load.php#L1679\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/classes/class-lazy-load.php#L496\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/includes/ls.unveilhooks.js#L116\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/includes/ls.unveilhooks.js#L178\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/classes/class-lazy-load.php#L1679\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/classes/class-lazy-load.php#L496\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/includes/ls.unveilhooks.js#L116\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/includes/ls.unveilhooks.js#L178\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://www.wordfence.com/threat-intel/vulnerabilities/id/e8af1fdb-7fec-4bbe-937b-ee2e76cf5c5b?source=cve\",\"source\":\"security@wordfence.com\"}]}}"
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.