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CVE-2026-7189 – Unauthenticated Sensitive Data Disclosure and ACL Bypass – Proliz OBS before v3.6.0

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Summary

CVE-2026-7189 is a high-severity vulnerability (CVSS 8.2) affecting Proliz Software Ltd. Co.’s OBS — a web-based Student Affairs Information System (Öğrenci Bilgi Sistemi) deployed across Turkish universities. The flaw involves the insertion of sensitive information into transmitted data (CWE-201), enabling unauthenticated remote attackers to access functionality not properly constrained by access control lists (ACLs). All versions of Proliz OBS prior to v3.6.0 are affected.

Technical details

  • Root cause: The application inserts sensitive information into data sent over the network (CWE-201). This exposed data can be leveraged by an attacker to bypass access controls and reach functionality that should be restricted.
  • Trigger conditions: Exploitable remotely with no authentication and no user interaction required. The OBS platform is internet-facing by design — students, faculty, and administrators access it via public URLs — making all unpatched instances directly reachable.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: High confidentiality impact — sensitive information is exposed; low integrity impact — an attacker can reach and interact with ACL-constrained functionality (CAPEC-1). No availability impact.

Affected software

  • Proliz OBS (Student Affairs Information System) — all versions prior to v3.6.0

Severity

  • CVSS v3.1 Base Score: 8.2 (HIGH)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Mitigation and recommended actions

  • Immediate: Upgrade Proliz OBS to v3.6.0 or later, which contains the vendor-provided fix per the Turkish Cyber Security Authority advisory (TR-26-0571).
  • If immediate patching is not feasible: Restrict network access to OBS-hosted endpoints to trusted institutional IP ranges and monitor access logs for anomalous unauthenticated requests targeting protected application paths.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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