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

Show details on source website

JSON

To clipboard

{
  "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

CWE

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

Assigner

Wordfence

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

	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"
            }
          ]
        }
      ],
      "providerMetadata": {
        "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"
        }
      ],
      "title": "HTTP Headers \u003c= 1.19.2 - Authenticated (Administrator+) CRLF Injection via Custom Header Values"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-2717",
    "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

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.

Action not permitted

GHSA-R256-59W3-3GR2

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

Tags

Sightings

Nomenclature