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CVE-2026-75791 – Authentication Bypass (REST API) – ManageEngine ADSelfService Plus before Build 700

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Summary

CVE-2026-75791 is an authentication bypass vulnerability (CWE-306: Missing Authentication for Critical Function) affecting the REST API of Zohocorp ManageEngine ADSelfService Plus. A specially crafted request can bypass authorization checks and reach API operations that should be restricted to authenticated administrators. The flaw carries a CVSS v3.1 base score of 8.6 (High) and is remotely exploitable without authentication or user interaction.

Technical details

  • Root cause: inconsistent authorization enforcement across REST API endpoints in ADSelfService Plus, allowing certain requests to reach restricted operations without valid credentials.
  • Trigger condition: an attacker sends a specially crafted request to the product’s REST API; no authentication, privileges, or user interaction are required.
  • Attack vector: network-accessible, low attack complexity (AV:N/AC:L/PR:N/UI:N).
  • Impact: potential unauthorized access to REST API operations normally restricted to administrators, including reading product and directory configuration data, modifying administrator-restricted settings, and disrupting legitimate product access (CVSS impact: Confidentiality Low, Integrity Low, Availability High).

Affected software

  • Zohocorp ManageEngine ADSelfService Plus — all builds prior to build 7001

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Mitigation and recommended actions

  • Immediate: Upgrade ManageEngine ADSelfService Plus to build 7001 or later via the official service pack from Zohocorp.
  • If immediate patching is not possible: restrict network exposure of the ADSelfService Plus REST API and administrative interfaces to trusted internal networks only, and monitor for anomalous or unauthenticated API requests until the patch can be applied.

References

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