CVE-2026-83455

Executive Summary

CVE-2026-83455 is a critical vulnerability in the Oracle Demand Signal Repository component of Oracle E-Business Suite (Internal Operations), affecting supported versions 12.2.3 through 12.2.15. The flaw is easily exploitable by a low-privileged attacker with network access via HTTP, allowing unauthorized creation, deletion, or modification of critical data, as well as full read access to all accessible data within the product. With a CVSS 3.1 base score of 8.1 and no available patch or public PoC, organizations running affected versions face significant risk of data integrity and confidentiality compromise.

Technical Analysis

The vulnerability resides in the Internal Operations component of Oracle Demand Signal Repository, a module within Oracle E-Business Suite responsible for demand planning and signal aggregation. According to the NVD description, the flaw is network-accessible via HTTP and requires only low privileges to exploit. The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N) indicates that no user interaction is required and the attack is low complexity, with high impact on both confidentiality and integrity.

The specific technical mechanism is not detailed in the available intelligence. No CWE classification, function names, class names, URL endpoints, or parameter names are provided in the NVD description or CNA title. The vulnerability class cannot be definitively determined from the sparse description, but the impact profile—unauthorized read and write access to critical data with low privileges—suggests a broken access control or authorization bypass issue (potentially CWE-284: Improper Access Control) or an injection flaw (such as SQL injection) that permits data manipulation. Because no public PoC, Nuclei template, or exploit code exists, any code-level explanation would be speculative and is therefore omitted. The attack surface is the HTTP interface of the Oracle Demand Signal Repository, which is typically exposed internally or to authenticated business partners. The lack of user interaction and low privilege requirement lower the barrier for exploitation once network access is obtained.

Exploitation Scenarios

No public PoC or exploit code is available for CVE-2026-83455. The attack chain below is inferred strictly from the vulnerability class and the NVD description; no specific function names, endpoints, or parameters are fabricated.

1. Reconnaissance/target identification: An attacker with network access to the Oracle E-Business Suite environment identifies the Oracle Demand Signal Repository HTTP interface. This can be done via Shodan dorks (e.g., http.title:"Oracle E-Business Suite" or http.html:"Demand Signal Repository") or by scanning internal networks for the known Oracle EBS web entry points.

2. Triggering the flaw class: The attacker, possessing low privileges (e.g., a valid low-privileged account or a compromised session), sends crafted HTTP requests to the Demand Signal Repository component. Because the flaw is "easily exploitable" and requires no user interaction, the attacker can directly interact with the vulnerable functionality. The exact request structure is unknown; the vulnerability likely involves insufficient authorization checks or improper input handling on a specific operation within Internal Operations.

3. Payload/execution method at the vulnerability-class level: Depending on the underlying flaw class (e.g., broken access control or injection), the attacker may bypass authentication/authorization checks or inject malicious data to manipulate the backend database. The payload is delivered over HTTP; no specific parameter names or payload syntax can be provided from the available intelligence.

4. Post-exploitation impact: Successful exploitation results in unauthorized creation, deletion, or modification of critical data and unauthorized read access to all Oracle Demand Signal Repository accessible data. This could allow the attacker to corrupt demand planning data, exfiltrate sensitive business information, or use the compromised component as a pivot point within the E-Business Suite environment.

Impact Assessment

The CVSS 3.1 base score is 8.1 (High), with the vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. The confidentiality and integrity impacts are both High, while availability impact is None. This means an attacker can read, create, delete, or modify critical data but cannot directly cause a denial of service. The scope is unchanged, so the impact is confined to the Oracle Demand Signal Repository component, although lateral movement within the broader E-Business Suite remains possible. Business impact includes potential corruption of demand planning data, unauthorized access to trade secrets or financial forecasts, and regulatory compliance violations (e.g., SOX, GDPR) if sensitive data is exposed. Affected systems are any Oracle E-Business Suite 12.2.3–12.2.15 deployments with the Demand Signal Repository module enabled. The blast radius includes all data accessible by the vulnerable component, which may include supplier, customer, and internal operational data.

Detection Guidance

Sigma Rule

title: Oracle E-Business Suite Demand Signal Repository Unauthorized Access Attempt
id: 8a4b3c2d-1e5f-6a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests to Oracle Demand Signal Repository endpoints that may indicate exploitation of CVE-2026-83455.
author: Valters IT Threat Intelligence
date: 2026-05-18
logsource:
  category: webserver
  product: oracle_ebs
detection:
  selection:
    cs-uri-stem|contains:
      - '/DemandSignalRepository'
      - '/demandSignal'
    sc-status:
      - 200
      - 500
  condition: selection
falsepositives:
  - Legitimate administrative activity
level: high
tags:
  - attack.t1190
  - cve.2026-83455

YARA Rule

rule CVE_2026_83455_Oracle_Demand_Signal_Repository_Exploit
{
    meta:
        description = "Detects potential exploitation of CVE-2026-83455 in Oracle Demand Signal Repository"
        author = "Valters IT Threat Intelligence"
        date = "2026-05-18"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-83455"
        cve = "CVE-2026-83455"
    strings:
        $s1 = "DemandSignalRepository" ascii wide nocase
        $s2 = "InternalOperations" ascii wide nocase
        $s3 = "Oracle E-Business Suite" ascii wide nocase
    condition:
        any of them
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-83455 Oracle Demand Signal Repository Exploitation Attempt"; flow:to_server,established; http.uri; content:"/DemandSignalRepository"; nocase; http.header; content:"User-Agent|3a|"; classtype:attempted-user; sid:10000001; rev:1; reference:cve,2026-83455;)

Elastic Detection

network where
  http.request.method == "POST" and
  http.request.uri : ("*DemandSignalRepository*" or "*demandSignal*") and
  process.name : ("java" or "oracle")

Splunk SPL Query

index=web_logs sourcetype=oracle_ebs
| search uri_path="*DemandSignalRepository*" OR uri_path="*demandSignal*"
| stats count by src_ip, uri_path, status, user_agent
| where count > 5

Wazuh OSSEC Rule

<group name="oracle_ebs,">
  <rule id="100100" level="12">
    <decoded_as>web-accesslog</decoded_as>
    <match>DemandSignalRepository</match>
    <description>CVE-2026-83455: Possible Oracle Demand Signal Repository exploitation attempt</description>
    <mitre>
      <id>T1190</id>
    </mitre>
  </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 Oracle Demand Signal Repository HTTP interface to trusted IP ranges only.
   • Enforce strong authentication and least privilege for all accounts that can access the component.
   • Enable detailed logging and monitoring for HTTP requests to the Demand Signal Repository, using the detection rules above.
   • Consider disabling the Demand Signal Repository module if it is not business-critical.

2. Patch/upgrade steps:

   • No patch is currently available from any tracked source. Monitor Oracle's Critical Patch Update (CPU) advisories and the NVD entry for CVE-2026-83455 for future patches.
   • Once a patch is released, apply it immediately to all affected versions (12.2.3–12.2.15).

3. Long-term hardening:

   • Implement a Web Application Firewall (WAF) with virtual patching for known attack patterns against Oracle E-Business Suite.
   • Conduct regular security assessments and penetration tests of the E-Business Suite environment.
   • Apply the principle of least privilege to all database and application accounts.
   • Keep Oracle E-Business Suite and all dependent components up to date with the latest security patches.

References

• NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2026-83455
• Oracle Critical Patch Updates: https://www.oracle.com/security-alerts/
• CISA KEV Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CVE-2026-83455 not listed as of report date)
• Oracle E-Business Suite Security Guide: https://docs.oracle.com/cd/E26401_01/doc.122/e22952/toc.htm
• MITRE ATT&CK T1190: https://attack.mitre.org/techniques/T1190/

No known threat actor campaigns or exploit-in-the-wild evidence are available for this CVE at the time of writing.