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    4 vulnerabilities by jugmac00

    CVE-2026-54567 (GCVE-0-2026-54567)

    Vulnerability from nvd – Published: 2026-09-14 17:15 – Updated: 2026-09-16 15:22
    VLAI
    Title
    Flask-Reuploaded: Extension-denylist bypass via case-folding asymmetry in name-override path (incomplete-fix variant of CVE-2026-27641)
    Summary
    Flask-Reuploaded provides file uploads for Flask. From 1.5.0 until 1.6.0, UploadSet.save(storage, name=...) in src/flask_uploads/flask_uploads.py applies lowercase_ext to the default upload path but uses the case-preserving extension helper for a caller-supplied name before extension_allowed evaluates an AllExcept denylist. An attacker who controls the name override can use a mixed-case dangerous extension to bypass a lowercase denylist and store the file in the served upload directory. Exploitation requires a denylist configuration, a user-influenced name override, and a deployment that resolves or executes extensions case-insensitively; pure allowlists remain protected and path containment is not bypassed. On an execution-capable upload directory, the stored file can execute with the web server's privileges and affect confidentiality, integrity, and availability. This issue is fixed in version 1.6.0.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-16 15:22 UTC
    CWE
    • CWE-178 - Improper Handling of Case Sensitivity
    • CWE-434 - Unrestricted Upload of File with Dangerous Type
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-27641 (GCVE-0-2026-27641)

    Vulnerability from nvd – Published: 2026-02-25 03:54 – Updated: 2026-02-25 21:12
    VLAI
    Title
    Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection
    Summary
    Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploaded has been patched in version 1.5.0. Some workarounds are available. Do not pass user input to the `name` parameter, use auto-generated filenames only, and implement strict input validation if `name` must be used.
    Severity
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-02-25 21:12 UTC
    CWE
    • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-54567 (GCVE-0-2026-54567)

    Vulnerability from cvelistv5 – Published: 2026-09-14 17:15 – Updated: 2026-09-16 15:22
    VLAI
    Title
    Flask-Reuploaded: Extension-denylist bypass via case-folding asymmetry in name-override path (incomplete-fix variant of CVE-2026-27641)
    Summary
    Flask-Reuploaded provides file uploads for Flask. From 1.5.0 until 1.6.0, UploadSet.save(storage, name=...) in src/flask_uploads/flask_uploads.py applies lowercase_ext to the default upload path but uses the case-preserving extension helper for a caller-supplied name before extension_allowed evaluates an AllExcept denylist. An attacker who controls the name override can use a mixed-case dangerous extension to bypass a lowercase denylist and store the file in the served upload directory. Exploitation requires a denylist configuration, a user-influenced name override, and a deployment that resolves or executes extensions case-insensitively; pure allowlists remain protected and path containment is not bypassed. On an execution-capable upload directory, the stored file can execute with the web server's privileges and affect confidentiality, integrity, and availability. This issue is fixed in version 1.6.0.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-16 15:22 UTC
    CWE
    • CWE-178 - Improper Handling of Case Sensitivity
    • CWE-434 - Unrestricted Upload of File with Dangerous Type
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-27641 (GCVE-0-2026-27641)

    Vulnerability from cvelistv5 – Published: 2026-02-25 03:54 – Updated: 2026-02-25 21:12
    VLAI
    Title
    Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection
    Summary
    Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploaded has been patched in version 1.5.0. Some workarounds are available. Do not pass user input to the `name` parameter, use auto-generated filenames only, and implement strict input validation if `name` must be used.
    Severity
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-02-25 21:12 UTC
    CWE
    • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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          "url": "https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr"
        },
        {
          "name": "https://github.com/jugmac00/flask-reuploaded/pull/180",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jugmac00/flask-reuploaded/pull/180"
        },
        {
          "name": "https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288"
        }
      ],
      "source": {
        "advisory": "GHSA-65mp-fq8v-56jr",
        "discovery": "UNKNOWN"
      },
      "title": "Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-27641",
    "datePublished": "2026-02-25T03:54:54.391Z",
    "dateReserved": "2026-02-20T22:02:30.029Z",
    "dateUpdated": "2026-02-25T21:12:45.608Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}