Vulnerability-Lookup

GHSA-J6HF-W48H-C9F9

Vulnerability from github – Published: 2026-10-24 00:32 – Updated: 2026-10-24 00:32

Details

The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user.

A non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines.

This lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback.

This is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.

Severity

8.8 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-115935"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T22:16:59Z",
    "severity": "HIGH"
  },
  "details": "The\u00a0app/process-api-response-headers\u00a0action accepts fake Craft API response headers from any authenticated control panel user.\n\n\n\nA non-admin user with only\u00a0accessCp\u00a0can place newline characters in\u00a0X-Craft-Plugin-Licenses. Craft passes this value to its\u00a0.env\u00a0writer without removing the newlines.\n\n\n\nThis lets the user insert a new attacker-known\u00a0CRAFT_SECURITY_KEY\u00a0into\u00a0.env. After Craft loads that key, the user can forge a signed login redirect containing a Twig\u00a0system()\u00a0callback.\n\n\n\nThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.",
  "id": "GHSA-j6hf-w48h-c9f9",
  "modified": "2026-10-24T00:32:35Z",
  "published": "2026-10-24T00:32:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-9hp6-3565-gvh5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115935"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/releases/tag/5.11.2"
    },
    {
      "type": "WEB",
      "url": "https://www.hckrt.com/hacktivity/HCKRT-WM3VSE"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-115935 (GCVE-0-2026-115935)

Vulnerability from cvelistv5 – Published: 2026-10-23 21:40 – Updated: 2026-10-23 21:40

Title

Control panel only API response emulation replaces "securityKey" and reaches server RCE

Summary

The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user. A non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines. This lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback. This is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


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

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

Hackrate CNA under the icscert root

CNA scorecard B 87/100 over 10 records in the last 180 days details

References

4 references

URL	Tags
https://www.hckrt.com/hacktivity/HCKRT-WM3VSE	third-party-advisorytechnical-descriptionmitigation
https://github.com/craftcms/cms/releases/tag/5.11.2	release-notes
https://github.com/craftcms/cms	product
https://github.com/craftcms/cms/security/advisori…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
craftcms	cms	Affected: 5.0.0 , < 5.11.2 (semver) Affected: 4.0.0 , < 4.18.9 (semver) cpe:2.3:a:craftcms:cms:::::::: cpe:2.3:a:craftcms:cms::::::::

Credits

Mohamed Wagdy (@Kalawy) Hackrate

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected",
          "packageName": "craftcms/cms",
          "product": "cms",
          "vendor": "craftcms",
          "versions": [
            {
              "lessThan": "5.11.2",
              "status": "affected",
              "version": "5.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "4.18.9",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:craftcms:cms:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.11.2",
                  "versionStartIncluding": "5.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:craftcms:cms:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.18.9",
                  "versionStartIncluding": "4.0.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "OR"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Mohamed Wagdy (@Kalawy)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Hackrate"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eThe\u0026nbsp;\u003ccode\u003eapp/process-api-response-headers\u003c/code\u003e\u0026nbsp;action accepts fake Craft API response headers from any authenticated control panel user.\u003c/p\u003e\u003cp\u003eA non-admin user with only\u0026nbsp;\u003ccode\u003eaccessCp\u003c/code\u003e\u0026nbsp;can place newline characters in\u0026nbsp;\u003ccode\u003eX-Craft-Plugin-Licenses\u003c/code\u003e. Craft passes this value to its\u0026nbsp;\u003ccode\u003e.env\u003c/code\u003e\u0026nbsp;writer without removing the newlines.\u003c/p\u003e\u003cp\u003eThis lets the user insert a new attacker-known\u0026nbsp;\u003ccode\u003eCRAFT_SECURITY_KEY\u003c/code\u003e\u0026nbsp;into\u0026nbsp;\u003ccode\u003e.env\u003c/code\u003e. After Craft loads that key, the user can forge a signed login redirect containing a Twig\u0026nbsp;\u003ccode\u003esystem()\u003c/code\u003e\u0026nbsp;callback.\u003c/p\u003e\u003cp\u003eThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.\u003c/p\u003e"
            }
          ],
          "value": "The\u00a0app/process-api-response-headers\u00a0action accepts fake Craft API response headers from any authenticated control panel user.\n\n\n\nA non-admin user with only\u00a0accessCp\u00a0can place newline characters in\u00a0X-Craft-Plugin-Licenses. Craft passes this value to its\u00a0.env\u00a0writer without removing the newlines.\n\n\n\nThis lets the user insert a new attacker-known\u00a0CRAFT_SECURITY_KEY\u00a0into\u00a0.env. After Craft loads that key, the user can forge a signed login redirect containing a Twig\u00a0system()\u00a0callback.\n\n\n\nThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "CWE-94 Improper Control of Generation of Code (\u0027Code Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T21:40:57.592Z",
        "orgId": "7004884b-51e2-48e8-b4a2-5ca29e80453e",
        "shortName": "Hackrate"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory",
            "technical-description",
            "mitigation"
          ],
          "url": "https://www.hckrt.com/hacktivity/HCKRT-WM3VSE"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/craftcms/cms/releases/tag/5.11.2"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/craftcms/cms"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://github.com/craftcms/cms/security/advisories/GHSA-9hp6-3565-gvh5"
        }
      ],
      "source": {
        "advisory": "GHSA-9hp6-3565-gvh5",
        "discovery": "UNKNOWN"
      },
      "title": "Control panel only API response emulation replaces \"securityKey\" and reaches server RCE",
      "x_generator": {
        "engine": "Vulnogram 1.0.4"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "7004884b-51e2-48e8-b4a2-5ca29e80453e",
    "assignerShortName": "Hackrate",
    "cveId": "CVE-2026-115935",
    "datePublished": "2026-10-23T21:40:57.592Z",
    "dateReserved": "2026-10-23T21:23:18.607Z",
    "dateUpdated": "2026-10-23T21:40:57.592Z",
    "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.

Vulnerability timeline

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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.

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