Vulnerability-Lookup

GHSA-QPV7-FM86-F6W8

Vulnerability from github – Published: 2026-09-02 09:31 – Updated: 2026-09-02 09:31

Details

The Broken Link Checker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author URL / Link Log in all versions up to, and including, 2.4.13 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. Exploitation requires an administrator to perform the plugin's standard dismiss-and-recheck workflow on a link submitted by the attacker via the WordPress comment author URL field, after which the attacker's HTTP server issues a redirect to a URL containing an HTML/JavaScript payload that is stored verbatim in the link log.

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-2026-75528"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-02T08:16:45Z",
    "severity": "HIGH"
  },
  "details": "The Broken Link Checker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author URL / Link Log in all versions up to, and including, 2.4.13 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. Exploitation requires an administrator to perform the plugin\u0027s standard dismiss-and-recheck workflow on a link submitted by the attacker via the WordPress comment author URL field, after which the attacker\u0027s HTTP server issues a redirect to a URL containing an HTML/JavaScript payload that is stored verbatim in the link log.",
  "id": "GHSA-qpv7-fm86-f6w8",
  "modified": "2026-09-02T09:31:30Z",
  "published": "2026-09-02T09:31:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75528"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/includes/admin/table-printer.php#L658"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/includes/links.php#L485"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/modules/checkers/http.php#L291"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/modules/checkers/http.php#L432"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/modules/containers/comment.php#L228"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/includes/admin/table-printer.php#L658"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/includes/links.php#L485"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/modules/checkers/http.php#L291"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/modules/checkers/http.php#L432"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/modules/containers/comment.php#L228"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?old_path=%2Fbroken-link-checker/tags/2.4.13\u0026new_path=%2Fbroken-link-checker/tags/2.4.13.1"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3662785%40broken-link-checker%2Ftags%2F2.4.13.1\u0026old=3644192%40broken-link-checker%2Ftags%2F2.4.13"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/ec96308f-3944-48c5-94be-b1555c0830b7?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"
    }
  ]
}

CVE-2026-75528 (GCVE-0-2026-75528)

Vulnerability from cvelistv5 – Published: 2026-09-02 07:39 – Updated: 2026-09-02 12:54

Title

Broken Link Checker <= 2.4.13 - Unauthenticated Stored Cross-Site Scripting via Comment Author URL / Link Log

Summary

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: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 12:54 UTC

CWE

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

Assigner

Wordfence mitre root

References

13 references

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

Impacted products

1 product

Vendor	Product	Version
wpmudev	Broken Link Checker	Affected: 0 , ≤ 2.4.13 (semver)

Credits

Adrien Brunner

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-75528",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T12:54:18.070685Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-02T12:54:35.366Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Broken Link Checker",
          "vendor": "wpmudev",
          "versions": [
            {
              "lessThanOrEqual": "2.4.13",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
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          "type": "finder",
          "value": "Adrien Brunner"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Broken Link Checker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author URL / Link Log in all versions up to, and including, 2.4.13 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. Exploitation requires an administrator to perform the plugin\u0027s standard dismiss-and-recheck workflow on a link submitted by the attacker via the WordPress comment author URL field, after which the attacker\u0027s HTTP server issues a redirect to a URL containing an HTML/JavaScript payload that is stored verbatim in the link log."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
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        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/includes/admin/table-printer.php#L658"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/includes/links.php#L485"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/modules/checkers/http.php#L291"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/modules/checkers/http.php#L432"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.13/legacy/modules/containers/comment.php#L228"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/includes/admin/table-printer.php#L658"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/includes/links.php#L485"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/modules/checkers/http.php#L291"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/modules/checkers/http.php#L432"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/broken-link-checker/tags/2.4.8/legacy/modules/containers/comment.php#L228"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3662785%40broken-link-checker%2Ftags%2F2.4.13.1\u0026old=3644192%40broken-link-checker%2Ftags%2F2.4.13"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset?old_path=%2Fbroken-link-checker/tags/2.4.13\u0026new_path=%2Fbroken-link-checker/tags/2.4.13.1"
        }
      ],
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          "lang": "en",
          "time": "2026-08-17T21:06:29.000Z",
          "value": "Vendor Notified"
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          "lang": "en",
          "time": "2026-09-01T18:57:15.000Z",
          "value": "Disclosed"
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      "title": "Broken Link Checker \u003c= 2.4.13 - Unauthenticated Stored Cross-Site Scripting via Comment Author URL / Link Log"
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    "assignerShortName": "Wordfence",
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    "datePublished": "2026-09-02T07:39:09.117Z",
    "dateReserved": "2026-08-17T20:50:07.207Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.