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CVE-2026-90924 – Default Credentials Leading to Full System Compromise – Logsign SIEM 6.4.101–6.4.11

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Summary

CVE-2026-90924 is a critical default-credentials vulnerability (CWE-1392) affecting Logsign SIEM, a security information and event management platform from Innotim Software, Telecommunications and Consultancy Trade Ltd. Co. The flaw allows a remote, unauthenticated attacker to log in using common or default usernames and passwords that ship with the product and are not enforced to be changed during deployment. Given the CVSS score of 9.8 (Critical), successful exploitation grants full compromise of confidentiality, integrity, and availability of the SIEM instance.

Technical details

  • Root cause: Logsign SIEM ships with default or commonly known administrative credentials that are not required to be changed during installation or first-run configuration.
  • Trigger conditions: An attacker only needs network-level access to the Logsign SIEM management interface; no valid session, prior authentication, or user interaction is required.
  • Attack vector: Network (AV:N) — exploitable remotely over the network, with low attack complexity (AC:L) and no privileges required (PR:N).
  • Impact: Successful login with default credentials grants an attacker high confidentiality, integrity, and availability impact — effectively full administrative control over the SIEM platform, including access to aggregated log data, security alerts, and potentially the ability to tamper with or disable security monitoring across the environment it protects.

Affected software

  • Logsign SIEM versions 6.4.101 through 6.4.116 (inclusive)
  • Fixed in version 6.4.117

Severity

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

Mitigation and recommended actions

  • Immediate: Upgrade Logsign SIEM to version 6.4.117 or later, where the default-credentials issue has been remediated.
  • If upgrading immediately is not possible:
    • Change all default and commonly known administrative/service account credentials on the Logsign SIEM appliance immediately.
    • Restrict network access to the Logsign SIEM management interface to trusted, internal IP ranges only — do not expose it directly to the internet.
    • Enforce strong, unique passwords and, where supported, multi-factor authentication for all Logsign accounts.
    • Monitor authentication logs on the SIEM platform itself for unexpected or anomalous login activity, particularly from unfamiliar source addresses.

References

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