CVE-2026-82825

Executive Summary

CVE-2026-82825 is a critical missing-authentication vulnerability (CWE-306) in the Hitachi Coding Software Suite affecting all versions through 3.3.0. Because a critical API function lacks an authentication check, an unauthenticated remote attacker can invoke it directly, enabling unauthorized retrieval or alteration of sensitive information or unauthorized manipulation of the product's state. With a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), the flaw is network-reachable, requires no privileges or user interaction, and has high confidentiality and integrity impact, making it a top-priority exposure for any internet-facing deployment.

Technical Analysis

The vulnerability class is Missing Authentication for Critical Function (CWE-306). Per the NVD description, the Hitachi Coding Software Suite "contains a vulnerability related to Missing Authentication for Critical Function," which "allows an unauthenticated attacker to invoke a critical API." This means the affected API endpoint or function is reachable and executes its privileged operation without validating caller identity, session, or authorization token. The description does not name the specific endpoint, API path, or parameter involved, and no CNA title or additional vendor detail is provided; this report therefore analyzes the issue strictly at the vulnerability-class level and does not attribute specific function or route names.

The attack surface is remote and network-exposed (CVSS AV:N). The absence of an authentication requirement (PR:N) and of user interaction (UI:N) means the barrier to exploitation is only reachability — no credential, invite, or social step is needed. Because the missing control gates a "critical" function, the exposed operation is presumed to perform state-changing or data-returning work rather than a benign health check; the description explicitly ties impact to retrieval or alteration of sensitive information and to "unauthorized manipulation."

Scope is unchanged (S:U), so impact is confined to the Hitachi Coding Software Suite's own security context rather than crossing a trust boundary into a separate component per the CVSS scoring. Confidentiality and Integrity are both High (C:H/I:H), while Availability is High only implicitly through the same metric group in the vector. The flaw is not tied to a memory-safety class (e.g., buffer overflow) nor to a logic-only race; it is a straightforward authorization/authentication design omission, which typically yields reliable, repeatable exploitation once the endpoint is identified. Patch confidence is 0/4 — no patch evidence exists from any tracked source, no vendor fix or workaround is published, and no affected-version exception list is available. No public PoC, exploit code, or Nuclei template is known, and EPSS has not yet scored the CVE.

Exploitation Scenarios

No public PoC is available; the attack chain below is inferred from the missing-authentication vulnerability class and the limited NVD description, and does not invent endpoint or parameter names.

1. Reconnaissance / target identification. An attacker identifies internet- or intranet-reachable instances of Hitachi Coding Software Suite (through 3.3.0) using network scanning and service/HTTP fingerprinting. Because the vulnerable operation is an API, the attacker probes exposed HTTP(S) services associated with the product and enumerates reachable API routes for the "critical function" referenced in the advisory.

2. Triggering the flaw class. The attacker sends a request directly to the critical API without supplying any authentication material. Because the endpoint lacks an authentication check (CWE-306), the request is processed as if it came from an authorized caller. The only precondition is that the API is reachable (AV:N, PR:N, UI:N) — no credential, valid session, or invitation is required.

3. Execution method (class level). The attacker invokes the critical function via a crafted request. At the class level, this is a direct invocation of an unauthenticated API operation; no specific payload syntax, header, or body field can be asserted because the advisory does not disclose them. If the function performs data retrieval, the response itself discloses sensitive information; if it performs state changes, the request mutates server-side state — this is the "unauthorized retrieval or alteration … or unauthorized manipulation" described by the vendor.

4. Post-exploitation impact. Successful invocation grants the attacker the capabilities of the privileged function without holding any credential. Depending on what that function does, this can result in exfiltration of sensitive data (C:H), tampering with configuration or stored information (I:H), and possible disruption of the product's operation. Because the attacker never authenticates, the activity may blend into legitimate API traffic and is not gated by account lockout or credential-based controls. Given the critical CVSS score and absence of a patch, affected systems should be treated as fully exposed until remediated.

Impact Assessment

Business impact is severe. A CVSS v3.1 base score of 9.8 reflects network-reachable (AV:N), low-complexity (AC:L), unauthenticated (PR:N), no-interaction (UI:N) exploitation with High Confidentiality and Integrity impact (C:H/I:H/A:H, Scope Unchanged). Any Hitachi Coding Software Suite deployment through version 3.3.0 that exposes the affected API is at risk of unauthorized data retrieval, unauthorized alteration of sensitive information, and unauthorized manipulation of the product's state. The blast radius is defined by what the critical function can reach: if it is an administrative or data-management API, the attacker's effective privileges equal those of the legitimate caller of that function. Because no authentication is required, the attack is trivially repeatable and difficult to attribute through credential telemetry. Organizations using the product on internet-facing or broadly reachable internal networks should assume compromise capability is available to any adversary who can route packets to the API. No CISA KEV listing, public exploit, or PoC currently exists, lowering immediate mass-exploitation likelihood but not the severity of the exposure.

Detection Guidance

Sigma Rule

title: Unauthenticated Invocation of Critical API - Hitachi Coding Software Suite (CVE-2026-82825)
id: 8f2c1a44-6b7e-4d1f-9a2c-3e5d7f0b9c11
status: experimental
description: Detects requests to the critical API of Hitachi Coding Software Suite that succeed without prior authentication, consistent with CWE-306 missing authentication.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-82825
author: valtersit.com
date: 2026/01/01
logsource:
  category: webserver
  product: hitachi_coding_software_suite
detection:
  selection_method:
    cs-method:
      - POST
      - PUT
      - PATCH
  selection_api:
    cs-uri-stem|contains:
      - '/api/'
  filter_authenticated:
    cs-username|exists: true
  condition: selection_method and selection_api and not filter_authenticated
fields:
  - c-ip
  - cs-method
  - cs-uri-stem
  - sc-status
falsepositives:
  - Legitimate unauthenticated endpoints (health checks) if they share the same URI path prefix
level: high
tags:
  - attack.initial_access
  - attack.t1190
  - cve.2026-82825

YARA Rule

rule CVE_2026_82825_Hitachi_Coding_Suite_Missing_Auth
{
    meta:
        description = "Detects references to Hitachi Coding Software Suite and CVE-2026-82825 in artifacts/config or logs"
        author = "valtersit.com"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-82825"
        date = "2026-01-01"
        severity = "critical"

    strings:
        $prod1 = "Hitachi Coding Software Suite" ascii wide nocase
        $prod2 = "Coding Software Suite" ascii wide nocase
        $cve   = "CVE-2026-82825" ascii wide nocase
        $ver   = "3.3.0" ascii wide

    condition:
        uint16(0) == 0x5A4D or
        (any of ($prod*) and $cve) or
        ($prod1 and $ver)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-82825 Hitachi Coding Software Suite Unauthenticated Critical API Access"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/"; nocase; http.header; content:"Authorization"; negate; nocase; threshold: type both, track by_src, count 5, seconds 60; reference:cve,2026-82825; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-82825; classtype:attempted-admin; sid:202682825; rev:1; metadata:created_at 2026_01_01, updated_at 2026_01_01, confidence Low;)

Elastic Detection

sequence by source.ip with maxspan=30s
  [ network where network.protocol == "http" and not exists(http.request.headers.authorization) ]
  [ http where url.path : "/api/*" and http.response.status_code == 200 ]

Splunk SPL Query

index=web sourcetype=access_combined
| eval has_auth=if(isnull(cs_username) OR cs_username="-" OR cs_username="", "no", "yes")
| where match(cs_uri_stem, "(?i)/api/") AND has_auth="no" AND (cs_method="POST" OR cs_method="PUT" OR cs_method="PATCH")
| stats count min(_time) as first_seen max(_time) as last_seen by src_ip, cs_method, cs_uri_stem, status
| where status>=200 AND status<300
| sort - count

Wazuh OSSEC Rule

<group name="hitachi,cve-2026-82825,web,">
  <rule id="202682825" level="12">
    <if_sid>31100</if_sid>
    <field name="url">/api/</field>
    <regex offset="after_parent">POST|PUT|PATCH</regex>
    <description>CVE-2026-82825: Unauthenticated request to Hitachi Coding Software Suite critical API</description>
    <mitre>
      <id>T1190</id>
    </mitre>
    <group>cve_2026_82825,attack.initial_access,</group>
  </rule>
</group>

Mitigation & Patch Guidance

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

Immediate mitigations (compensating controls, since no vendor fix or workaround exists):

• Remove or block network access to the affected API for any instance of Hitachi Coding Software Suite at version 3.3.0 or earlier. Place these deployments behind a firewall/ACL and do not expose them to untrusted networks.
• Enforce authentication at a reverse proxy or API gateway in front of the product (require a valid credential and session before any request reaches the critical API), since the product itself does not enforce authentication on the affected function.
• Restrict and monitor all inbound traffic to the API; alert on successful API responses to requests that carried no authentication header or credential.
• Assume potential prior unauthorized retrieval/alteration and review server-side data integrity and access logs for the affected API.

Patch/upgrade steps:

• No patched version is currently published; track Hitachi advisories for a fixed release above 3.3.0.
• When a fix becomes available, upgrade all instances through 3.3.0 to the patched version on an expedited schedule and validate that the critical API now requires authentication.

Long-term hardening:

• Adopt a deny-by-default posture for management/administrative APIs and require authentication and authorization on every critical function by design.
• Integrate API endpoints into a gateway that performs centralized authentication, authorization, and rate limiting.
• Maintain an inventory of Hitachi Coding Software Suite deployments and their exact versions, and subscribe to vendor and NVD notifications for this product line.

References

• NVD — CVE-2026-82825: https://nvd.nist.gov/vuln/detail/CVE-2026-82825
• CWE-306 — Missing Authentication for Critical Function: https://cwe.mitre.org/data/definitions/306.html
• MITRE ATT&CK — T1190 Exploit Public-Facing Application: https://attack.mitre.org/techniques/T1190/
• FIRST EPSS (not yet scored for this CVE): https://www.first.org/epss/
• CISA Known Exploited Vulnerabilities Catalog (CVE-2026-82825 NOT listed as of this report): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No known threat actor campaigns, public PoC, exploit code, or exploit-in-the-wild evidence are associated with CVE-2026-82825 at the time of writing; CISA KEV status is NO.