{
  "id": "CVE-2025-35939",
  "url": "https://spydr.io/cve/CVE-2025-35939",
  "published": "2025-05-07T23:15:54.103Z",
  "modified": "2026-06-17T09:14:18.460Z",
  "score": 6.9,
  "severity": "medium",
  "cvss_version": "4.0",
  "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/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",
  "score_source": "CNA",
  "epss": 0.01349,
  "epss_percentile": 0.70535,
  "exploited": true,
  "kev": {
    "added": "2025-06-02",
    "due": "2025-06-23",
    "action": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
    "ransomware": "Unknown",
    "name": "Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability",
    "notes": "https://github.com/craftcms/cms/pull/17220 ; https://nvd.nist.gov/vuln/detail/CVE-2025-35939"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "Craft"
  ],
  "products": [
    "Craft CMS"
  ],
  "cwes": [
    "CWE-472"
  ],
  "description": "Craft CMS stores arbitrary content provided by unauthenticated users in session files. This content could be accessed and executed, possibly using an independent vulnerability. Craft CMS redirects requests that require authentication to the login page and generates a session file on the server at '/var/lib/php/sessions'. Such session files are named 'sess_[session_value]', where '[session_value]' is provided to the client in a 'Set-Cookie' response header. Craft CMS stores the return URL requested by the client without sanitizing parameters. Consequently, an unauthenticated client can introduce arbitrary values, such as PHP code, to a known local file location on the server. Craft CMS versions 5.7.5 and 4.15.3 have been released to address this issue.",
  "status": "Analyzed",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": 6.9,
    "cvss_v31": 5.3,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://github.com/craftcms/cms/pull/17220",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/craftcms/cms/releases/tag/4.15.3",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://github.com/craftcms/cms/releases/tag/5.7.5",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-147-01.json",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-35939",
      "tags": [
        "VDB Entry"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-35939",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2025-35939",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}