Vulnerability-Lookup

CVE-2026-18109 (GCVE-0-2026-18109)

Vulnerability from cvelistv5 – Published: 2026-08-14 02:25 – Updated: 2026-08-14 10:45

Title

W3 Total Cache <= 2.10.3 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name

Summary

The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author Name in all versions up to, and including, 2.10.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable when the Lazy Load Images feature of W3 Total Cache is enabled, as the unsafe re-emission occurs exclusively within the LazyLoad mutator's img tag rewriting step.

Severity

7.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 10:44 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

Wordfence

References

8 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/w3-tot…
https://plugins.trac.wordpress.org/browser/w3-tot…
https://plugins.trac.wordpress.org/browser/w3-tot…
https://plugins.trac.wordpress.org/browser/w3-tot…
https://plugins.trac.wordpress.org/changeset?repo…
https://plugins.trac.wordpress.org/changeset/3635…
https://plugins.trac.wordpress.org/changeset?old_…

Impacted products

1 product

Vendor	Product	Version
boldgrid	W3 Total Cache	Affected: 0 , ≤ 2.10.3 (semver)

Credits

daroo

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-18109",
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GHSA-9QC5-QHM2-7HH3

Vulnerability from github – Published: 2026-08-14 03:31 – Updated: 2026-08-14 03:31

Details

Severity

7.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18109"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-14T03:16:19Z",
    "severity": "HIGH"
  },
  "details": "The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author Name in all versions up to, and including, 2.10.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable when the Lazy Load Images feature of W3 Total Cache is enabled, as the unsafe re-emission occurs exclusively within the LazyLoad mutator\u0027s img tag rewriting step.",
  "id": "GHSA-9qc5-qhm2-7hh3",
  "modified": "2026-08-14T03:31:25Z",
  "published": "2026-08-14T03:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18109"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.2/UserExperience_LazyLoad_Mutator.php#L162"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.2/UserExperience_LazyLoad_Mutator.php#L403"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.2/UserExperience_LazyLoad_Mutator.php#L85"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.2/UserExperience_LazyLoad_Plugin.php#L116"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset/3635675/w3-total-cache/trunk/UserExperience_LazyLoad_Mutator.php"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?old_path=%2Fw3-total-cache/tags/2.10.3\u0026new_path=%2Fw3-total-cache/tags/2.10.4"
    },
    {
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    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/16ac73ae-6a0a-4c9b-8830-e0745061e587?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-18109 (GCVE-0-2026-18109)

GHSA-9QC5-QHM2-7HH3

Tags

Sightings

Nomenclature