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Critical

Unauthenticated arbitrary file read via /uploads path traversal (URL-encoded separators) leading to instance takeover

Type: advisorySources: OSV

Postiz is an open-source social media scheduling tool. The route that serves locally stored media joins URL-supplied path segments onto the upload directory and streams the file without normalising the path or confining it to that directory, and the route requires no authentication. Raw dot-segments are collapsed before routing, but URL-encoded separators survive route matching and are decoded only once they reach the handler, restoring the traversal at the filesystem call. An unauthenticated remote attacker can therefore read any file readable by the application process, including the process environment, which exposes the JWT signing secret, the database connection string, and connected provider and billing secrets. Because session tokens are signed with that secret and carry no expiry, this allows forging a non-expiring session as any user, including an administrator, without a password.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-19264
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 11:15 UTC · Revision 1

Source evidence

Unauthenticated arbitrary file read via /uploads path traversal (URL-encoded separators) leading to instance takeover

core-osv · Original source

Published 7 Aug 2026, 14:15 UTC

Postiz is an open-source social media scheduling tool. The route that serves locally stored media joins URL-supplied path segments onto the upload directory and streams the file without normalising the path or confining it to that directory, and the route requires no authentication. Raw dot-segments are collapsed before routing, but URL-encoded separators survive route matching and are decoded only once they reach the handler, restoring the traversal at the filesystem call. An unauthenticated remote attacker can therefore read any file readable by the application process, including the process environment, which exposes the JWT signing secret, the database connection string, and connected provider and billing secrets. Because session tokens are signed with that secret and carry no expiry, this allows forging a non-expiring session as any user, including an administrator, without a password.

osv:CVE-2026-19264
Complete source record
{
  "id": "4269abd09878b17a1b00c5ce424af1aa1d1535a2418f44cc185a48ffaf519821",
  "url": "https://osv.dev/vulnerability/CVE-2026-19264",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Unauthenticated arbitrary file read via /uploads path traversal (URL-encoded separators) leading to instance takeover",
    "summary": "Postiz is an open-source social media scheduling tool. The route that serves locally stored media joins URL-supplied path segments onto the upload directory and streams the file without normalising the path or confining it to that directory, and the route requires no authentication. Raw dot-segments are collapsed before routing, but URL-encoded separators survive route matching and are decoded only once they reach the handler, restoring the traversal at the filesystem call. An unauthenticated remote attacker can therefore read any file readable by the application process, including the process environment, which exposes the JWT signing secret, the database connection string, and connected provider and billing secrets. Because session tokens are signed with that secret and carry no expiry, this allows forging a non-expiring session as any user, including an administrator, without a password.",
    "evidence": "osv:CVE-2026-19264",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-19264",
      "aliases": [
        "CVE-2026-19264"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gitroomhq/postiz-app",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c90b6c625bc0ec470d6dcdb57c63608aaa9b7b74"
                },
                {
                  "fixed": "7936062"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.22.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7936062"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c90b6c625bc0ec470d6dcdb57c63608aaa9b7b74"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.22.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.21.10",
            "v2.21.9",
            "v2.21.8",
            "v2.21.7",
            "v2.21.6",
            "v2.21.5",
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            "v1.1.0",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-19264.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.018340230Z",
      "provider": "osv",
      "references": [
        "https://gadvisory.org/advisories/PSA-2026-TH12B7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19264.json",
        "https://github.com/gitroomhq/postiz-app/releases/tag/v2.22.1",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-19264",
        "https://github.com/gitroomhq/postiz-app/commit/7936062",
        "https://github.com/gitroomhq/postiz-app"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "postiz",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19264.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-19264",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494867,
  "published_at": "2026-08-07T14:15:15.123+00:00"
}