Vulnerability-Lookup

GHSA-R256-59W3-3GR2

Vulnerability from github – Published: 2026-04-22 09:31 – Updated: 2026-04-22 09:31

Details

The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via insert_with_markers(). This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary newline characters and additional Apache directives into the .htaccess configuration file via the 'Custom Headers' settings, leading to Apache configuration parse errors and potential site-wide denial of service.

Severity

5.5 (Medium)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-2717"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-93"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-22T09:16:20Z",
    "severity": "MODERATE"
  },
  "details": "The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via `insert_with_markers()`. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary newline characters and additional Apache directives into the .htaccess configuration file via the \u0027Custom Headers\u0027 settings, leading to Apache configuration parse errors and potential site-wide denial of service.",
  "id": "GHSA-r256-59w3-3gr2",
  "modified": "2026-04-22T09:31:32Z",
  "published": "2026-04-22T09:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2717"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L1098"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L745"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L1098"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L745"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/7716e77f-e899-4046-9421-86fc0c36c245?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-2717 (GCVE-0-2026-2717)

Vulnerability from cvelistv5 – Published: 2026-04-22 07:45 – Updated: 2026-04-22 18:29

Title

HTTP Headers <= 1.19.2 - Authenticated (Administrator+) CRLF Injection via Custom Header Values

Summary

The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via `insert_with_markers()`. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary newline characters and additional Apache directives into the .htaccess configuration file via the 'Custom Headers' settings, leading to Apache configuration parse errors and potential site-wide denial of service.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 18:29 UTC

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Assigner

Wordfence mitre root Scorecard

References

5 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/http-h…
https://plugins.trac.wordpress.org/browser/http-h…
https://plugins.trac.wordpress.org/browser/http-h…
https://plugins.trac.wordpress.org/browser/http-h…

Impacted products

1 product

Vendor	Product	Version
zinoui	HTTP Headers	Affected: 0 , ≤ 1.19.2 (semver)

Credits

Kai Aizen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-2717",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T18:29:07.769656Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-22T18:29:28.392Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "HTTP Headers",
          "vendor": "zinoui",
          "versions": [
            {
              "lessThanOrEqual": "1.19.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Kai Aizen"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via `insert_with_markers()`. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary newline characters and additional Apache directives into the .htaccess configuration file via the \u0027Custom Headers\u0027 settings, leading to Apache configuration parse errors and potential site-wide denial of service."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-93",
              "description": "CWE-93 Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)",
              "lang": "en",
              "type": "CWE"
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        "dateUpdated": "2026-04-22T07:45:37.169Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/7716e77f-e899-4046-9421-86fc0c36c245?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L1098"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L1098"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L745"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L745"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-04-21T19:13:17.000Z",
          "value": "Disclosed"
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      ],
      "title": "HTTP Headers \u003c= 1.19.2 - Authenticated (Administrator+) CRLF Injection via Custom Header Values"
    }
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  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
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    "datePublished": "2026-04-22T07:45:37.169Z",
    "dateReserved": "2026-02-18T21:00:50.620Z",
    "dateUpdated": "2026-04-22T18:29:28.392Z",
    "state": "PUBLISHED"
  },
  "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.

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.

Action not permitted

GHSA-R256-59W3-3GR2

CVE-2026-2717 (GCVE-0-2026-2717)

Tags

Sightings

Nomenclature

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