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Medium

MISP OrganisationsController File Existence and Image-Type Oracle via Forged Upload tmp_name

Type: advisorySources: OSV

In MISP, the OrganisationsController::__uploadLogo method processed a caller-supplied tmp_name value with filesystem probes (file_exists, MIME type detection, EXIF reading) before verifying that the value corresponded to a genuine PHP file upload via is_uploaded_file. An authenticated site-admin user could supply an arbitrary server file path as the tmp_name parameter. The application would then probe that path and return distinct validation error messages depending on whether the file existed and what its image type was, effectively creating a file-existence and image-type oracle against the server filesystem. The vulnerability requires site-admin privileges and does not allow arbitrary file read, code execution, or modification; the impact is limited to disclosure of whether a given path exists on the server and, for image files, their type.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-95703
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 04:32 UTC · Revision 1

Source evidence

MISP OrganisationsController File Existence and Image-Type Oracle via Forged Upload tmp_name

core-osv · Original source

Published 22 Sept 2026, 14:49 UTC

In MISP, the OrganisationsController::__uploadLogo method processed a caller-supplied tmp_name value with filesystem probes (file_exists, MIME type detection, EXIF reading) before verifying that the value corresponded to a genuine PHP file upload via is_uploaded_file. An authenticated site-admin user could supply an arbitrary server file path as the tmp_name parameter. The application would then probe that path and return distinct validation error messages depending on whether the file existed and what its image type was, effectively creating a file-existence and image-type oracle against the server filesystem. The vulnerability requires site-admin privileges and does not allow arbitrary file read, code execution, or modification; the impact is limited to disclosure of whether a given path exists on the server and, for image files, their type.

osv:CVE-2026-95703
Complete source record
{
  "id": "2af842f312a9ed73c42cb0d6ac2aac90d171ca912ffedf703ec48d4cf8682e02",
  "url": "https://osv.dev/vulnerability/CVE-2026-95703",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MISP OrganisationsController File Existence and Image-Type Oracle via Forged Upload tmp_name",
    "summary": "In MISP, the OrganisationsController::__uploadLogo method processed a caller-supplied tmp_name value with filesystem probes (file_exists, MIME type detection, EXIF reading) before verifying that the value corresponded to a genuine PHP file upload via is_uploaded_file. An authenticated site-admin user could supply an arbitrary server file path as the tmp_name parameter. The application would then probe that path and return distinct validation error messages depending on whether the file existed and what its image type was, effectively creating a file-existence and image-type oracle against the server filesystem. The vulnerability requires site-admin privileges and does not allow arbitrary file read, code execution, or modification; the impact is limited to disclosure of whether a given path exists on the server and, for image files, their type.",
    "evidence": "osv:CVE-2026-95703",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-95703",
      "aliases": [
        "CVE-2026-95703"
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      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://github.com/misp/misp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
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                {
                  "fixed": "fc4220ed7900097dfbcdf48a0961f6713960ae11"
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                {
                  "fixed": "12eaadc9e"
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              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
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                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
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                    "source": "REFERENCES_COMMIT"
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          "database_specific": {
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        }
      ],
      "modified": "2026-10-28T02:30:26.075079922Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/95xxx/CVE-2026-95703.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-95703",
        "https://github.com/MISP/MISP/commit/12eaadc9e",
        "https://github.com/MISP/MISP"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20",
          "CWE-200"
        ],
        "cna_assigner": "CIRCL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/95xxx/CVE-2026-95703.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-95703",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492482,
  "published_at": "2026-09-22T14:49:42.588+00:00"
}