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CVE-2026-93467 – Unauthenticated RCE via Insecure Deserialization – HGiga OAKlouds custom_page (2.0/

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Summary

CVE-2026-93467 is a critical Insecure Deserialization vulnerability (CWE-502) affecting the custom_page module of HGiga’s OAKlouds enterprise collaboration platform. The flaw allows unauthenticated remote attackers to achieve arbitrary code execution on the underlying server by submitting maliciously crafted serialized data, without requiring any credentials or user interaction. The issue was reported by researcher Linwz of DEVCORE and disclosed by TWCERT/CC on September 18, 2026, carrying a critical severity rating.

Technical details

  • Root cause: The OAKlouds custom_page module deserializes attacker-supplied content without validating or restricting the types of objects that can be reconstructed, enabling insecure deserialization of untrusted data (CWE-502).
  • Trigger conditions: An attacker sends a specially crafted serialized payload to a reachable OAKlouds endpoint exposed by the custom_page component; no authentication or prior session is required.
  • Attack vector: Network-based (AV:N), low attack complexity, no privileges required, no user interaction — the vulnerability can be exploited directly over HTTP(S) against internet-facing OAKlouds deployments.
  • Impact: Successful exploitation results in arbitrary code execution on the server, giving an attacker full control over confidentiality, integrity, and availability of the affected system.

Affected software

  • HGiga OAKlouds custom_page 2.0 — versions prior to 26
  • HGiga OAKlouds custom_page 3.0 — versions prior to 26
  • HGiga OAKlouds custom_page 4.0 — versions prior to 26

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 Base Score: 9.3 (Critical) — 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

Mitigation and recommended actions

  • Immediate: Upgrade all affected OAKlouds custom_page deployments (2.0, 3.0, and 4.0) to version 26 or later, as provided by HGiga.
  • If immediate patching is not possible: Restrict network access to OAKlouds custom_page endpoints to trusted internal networks only, and place the application behind a web application firewall or reverse proxy capable of inspecting and blocking suspicious serialized payloads until the patch can be applied.
  • Review server and application logs for unexpected deserialization errors or unusual outbound connections that may indicate exploitation attempts.
  • Note: A related vulnerability, CVE-2026-93468 (Arbitrary File Read via path traversal), was disclosed in the same OAKlouds advisory and affects the bulletin_v3 module (versions before 107) — organizations running OAKlouds should review and patch both issues.

References

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