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CVE-2026-54767 – Unauthenticated Mass Data Destruction (Hardcoded Backdoor) – WeGIA ≤ 3.8.4

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Summary

CVE-2026-54767 is a critical vulnerability in WeGIA, an open-source web manager used by charitable institutions to administer members, contributors, and associated personal data. The flaw stems from a hardcoded secret key embedded in a publicly-visible source file that gates a destructive database endpoint, allowing any unauthenticated remote attacker to permanently wipe member and contributor records. The issue carries a CVSS v3.1 base score of 9.1 (Critical) and affects all WeGIA versions up to and including 3.8.4.

Technical details

  • Root cause: The endpoint web/html/socio/sistema/controller/deletar_socios.php authorizes destructive operations by comparing a request parameter ($_GET['chave']) against a static, hardcoded secret string embedded directly in the application’s public source code repository (CWE-798: Use of Hard-Coded Credentials).
  • Missing authentication: Beyond the weak hardcoded check, the endpoint performs no session, role, or authentication verification whatsoever before executing privileged database operations (CWE-306: Missing Authentication for Critical Function).
  • Trigger conditions: An attacker only needs network access to the WeGIA web application and knowledge of the hardcoded key value (obtainable by reviewing the public source repository) — no valid credentials, session, or user interaction are required.
  • Attack vector: Remote, unauthenticated, low-complexity HTTP request over the network (AV:N/AC:L/PR:N/UI:N).
  • Impact: Successful exploitation triggers TRUNCATE TABLE operations against the endereco, pessoafisica, pessoajuridica, and socio database tables, resulting in permanent, irreversible destruction of address, individual, organization, and member/contributor records. There is no confidentiality impact, but integrity and availability impacts are both rated High.

Affected software

  • WeGIA (web manager for charitable institutions) versions up to and including 3.8.4
  • Fixed in version 3.8.5, where the vulnerable deletar_socios.php endpoint was removed entirely

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade WeGIA to version 3.8.5 or later, which removes the vulnerable deletar_socios.php endpoint entirely.
  • If immediate patching is not possible:
    • Restrict network access to the WeGIA application to trusted internal networks or VPN only, blocking direct internet exposure.
    • Remove or block access to the socio/sistema/controller/deletar_socios.php path at the web server or reverse proxy/WAF layer.
    • Rotate any credentials or secrets that may have been derived from or stored alongside the exposed hardcoded key.
    • Ensure recent backups of member/contributor database tables exist and are tested for restoration, given the destructive nature of this vulnerability.

References

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