CVE-2026-12265

Executive Summary

CVE-2026-12265 is a high-severity insufficient access control vulnerability affecting Zohocorp ManageEngine DDI Central versions prior to build 6201. An authenticated attacker with low privileges can abuse the high-availability (HA) failover endpoint to perform destructive PostgreSQL database operations. With a CVSS base score of 8.8, successful exploitation can result in complete loss of confidentiality, integrity, and availability of the affected DDI Central database and dependent services, causing severe operational disruption to enterprise DNS, DHCP, and IP address management (DDI) infrastructure.

Technical Analysis

ManageEngine DDI Central is a unified DDI (DNS, DHCP, IP Address Management) platform that integrates with a PostgreSQL backend for configuration, lease, zone, and policy data. CVE-2026-12265 resides in the high-availability (HA) failover endpoint, which is designed to orchestrate state synchronization and failover between DDI Central nodes.

According to the NVD description, the vulnerability is classified as "insufficient access control" in the HA failover endpoint, which leads to destructive PostgreSQL database operations. This indicates that the endpoint does not adequately enforce authorization checks — such as role validation, administrative privilege gating, or session-based access control — before executing database-affecting actions. As a result, an authenticated user holding only low-privileged credentials can invoke the failover functionality and cause unintended, destructive operations against the underlying PostgreSQL database (e.g., dropping, truncating, or otherwise corrupting data or schema objects).

The CVSS vector (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) confirms:

• AV:N (Network) — the endpoint is reachable over the network, consistent with a web-accessible HA management interface.
• AC:L (Low) — no special conditions or race windows are required; the endpoint is directly callable.
• PR:L (Low) — the attacker must be authenticated, but only with low-level privileges.
• UI:N (None) — no user interaction is required.
• S:U (Unchanged) — the impact is scoped to DDI Central and its database.
• C/I/A:H — high impact across confidentiality, integrity, and availability, reflecting the destructive nature of the PostgreSQL operations.

No public proof-of-concept, exploit code, or Nuclei template is currently available. CWE classification is not assigned in the supplied data, but the behavior maps to improper access control (CWE-284) given the authorization bypass nature of the flaw. No public CVE details beyond the NVD description were available at the time of writing.

Exploitation Scenarios

No public PoC is available; the attack chain below is inferred from the vulnerability class (insufficient access control on an HA failover endpoint impacting a PostgreSQL backend). No specific function names, URL paths, or parameters are fabricated, as the supplied description does not enumerate them.

1. Reconnaissance / Target Identification An attacker identifies an internet- or intranet-exposed ManageEngine DDI Central instance running a version prior to 6201. This can be performed via Shodan/Censys queries (e.g., http.title:"ManageEngine DDI Central") or through internal network scanning. The attacker confirms the target's DDI Central login interface and version banner.

2. Authentication and Privilege Positioning Because the CVSS vector specifies PR:L, the attacker must first obtain low-privileged authenticated access. This may be achieved through valid but limited credentials (e.g., a standard operator account), credential reuse, or a separate low-severity authentication bypass. The attacker does not need administrative privileges for this flaw.

3. Triggering the Vulnerable Endpoint Once authenticated, the attacker locates and invokes the HA failover endpoint. The endpoint fails to enforce adequate authorization checks before executing database-related failover logic. Triggering the failover flow causes the backend to perform destructive PostgreSQL operations (e.g., dropping, truncating, or overwriting database state) without validating that the requesting user holds the required privileges.

4. Post-Exploitation Impact The destructive PostgreSQL operations corrupt or eliminate DDI Central data, potentially rendering DNS, DHCP, and IPAM services inoperable. Depending on deployment topology, this could cascade to dependent systems (e.g., DNS resolution failures, DHCP lease loss, loss of IP address records). Availability, integrity, and confidentiality impacts are all rated High.

Impact Assessment

The business impact is severe. DDI Central typically underpins critical network services — DNS resolution, DHCP leasing, and IP address management. Destruction of the PostgreSQL backend can:

• Disrupt name resolution and dynamic host configuration across the enterprise.
• Cause loss of authoritative zone, lease, and IP allocation records.
• Trigger failover behavior that may attempt to promote a corrupted or empty database replica, deepening the outage.
• Require time-consuming restoration from backups, assuming validated backups exist.

CVSS subscores (C:H/I:H/A:H) indicate full loss of confidentiality, integrity, and availability for the affected component. The attack is network-reachable (AV:N), requires no user interaction (UI:N), and demands only low privileges (PR:L), making it attractive to both external attackers with any foothold and malicious insiders. The scope is Unchanged (S:U), meaning impact is contained to DDI Central and its immediate database — but operationally, an outage of DDI Central affects the broader network. CISA KEV status is currently NO, and no exploit-in-the-wild evidence is available.

Detection Guidance

Sigma Rule

title: Potential Exploitation of ManageEngine DDI Central HA Failover Access Control Bypass (CVE-2026-12265)
id: 7f3c9a12-4b8e-4c1d-9e2a-1a2b3c4d5e6f
status: experimental
description: Detects suspicious access to HA failover endpoints or destructive PostgreSQL operations following authentication to ManageEngine DDI Central.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-12265
author: valtersit.com
date: 2026-01-01
logsource:
  category: webserver
  product: manageengine
detection:
  selection_endpoint:
    cs-uri-stem|contains:
      - '/failover'
      - '/ha/'
      - '/ha/failover'
  selection_method:
    cs-method:
      - 'POST'
      - 'PUT'
  condition: selection_endpoint and selection_method
falsepositives:
  - Legitimate administrative HA failover operations during maintenance windows
level: high
tags:
  - attack.t1190
  - cve.2026-12265

YARA Rule

rule CVE_2026_12265_DDI_Central_HA_Failover
{
    meta:
        description = "Detects references to ManageEngine DDI Central HA failover access control bypass (CVE-2026-12265)"
        author = "valtersit.com"
        date = "2026-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-12265"
        severity = "high"

    strings:
        $s1 = "DDI Central" ascii wide nocase
        $s2 = "ManageEngine" ascii wide nocase
        $s3 = "failover" ascii wide nocase
        $s4 = "ha/failover" ascii wide nocase
        $s5 = "PostgreSQL" ascii wide nocase

    condition:
        uint16(0) == 0x4D5A or
        (any of ($s1, $s2) and any of ($s3, $s4))
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-12265 ManageEngine DDI Central HA Failover Access Control Bypass Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"failover"; nocase; http.uri; content:"ha"; nocase; reference:cve,2026-12265; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-12265; classtype:attempted-admin; sid:202612265; rev:1; metadata:created_at 2026_01_01, updated_at 2026_01_01;)

Elastic Detection

sequence by host.id, user.name with maxspan=5m
  [ network where network.protocol == "http" and
      url.path : ("*failover*", "*ha/failover*") and
      http.request.method : ("POST", "PUT") and
      user.name : * ]

Splunk SPL Query

index=web OR index=proxy
| eval uri=lower(coalesce(uri, url, cs_uri_stem))
| where match(uri, "failover") AND match(uri, "ha")
| where upper(coalesce(method, http_method)) IN ("POST", "PUT")
| stats count min(_time) as first_seen max(_time) as last_seen values(uri) as uris by src_ip, user
| where count > 0
| convert ctime(first_seen) ctime(last_seen)

Wazuh OSSEC Rule

<group name="web,manageengine,ddi_central,">
  <rule id="100165" level="10">
    <decoded_as>web-accesslog</decoded_as>
    <if_sid>31100</if_sid>
    <url>failover|ha/failover</url>
    <method>POST|PUT</method>
    <description>CVE-2026-12265: Potential ManageEngine DDI Central HA failover access control bypass attempt</description>
    <mitre>
      <id>T1190</id>
    </mitre>
    <group>cve_2026_12265,access_control,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate Mitigations

   • Restrict network access to the DDI Central HA failover endpoint to trusted management networks only via firewall/ACL or reverse-proxy rules.
   • Enforce the principle of least privilege: audit and reduce low-privileged accounts; ensure HA operations require elevated roles where configurable.
   • Disable or restrict the HA failover feature if high availability is not actively required.
   • Ensure validated, immutable, and tested backups of the DDI Central PostgreSQL database exist, and verify restore procedures.
   • Enable detailed logging and alerting on requests to HA/failover endpoints.

2. Patch / Upgrade Steps

   • Upgrade ManageEngine DDI Central to version 6201 or later as indicated by the NVD description.
   • Monitor Zohocorp's official ManageEngine security advisory portal for the confirmed fix release, as no vendor advisory was available at time of writing.
   • After upgrading, verify the HA failover endpoint enforces proper authorization.

3. Long-Term Hardening

   • Adopt centralized IAM with role-based access control and MFA for all DDI Central administrative interfaces.
   • Conduct periodic access control reviews of HA and database-affecting endpoints.
   • Deploy network segmentation for DDI infrastructure and continuous vulnerability scanning.
   • Integrate the detection rules above into the SOC to monitor for future exploitation attempts.

References

• NVD — CVE-2026-12265: https://nvd.nist.gov/vuln/detail/CVE-2026-12265
• Zohocorp ManageEngine Security Advisory Portal: https://www.manageengine.com/security/advisory.html
• ManageEngine DDI Central Product Page: https://www.manageengine.com/ddi-central/
• CWE-284 — Improper Access Control: https://cwe.mitre.org/data/definitions/284.html
• CISA Known Exploited Vulnerabilities Catalog (status: not listed as of writing): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No known threat actor campaigns or exploit-in-the-wild evidence were identified for CVE-2026-12265 at the time of writing.