Oracle Service Bus: Takeover via HTTP by low-privileged attacker
Summary
Oracle Service Bus, a component of Oracle Fusion Middleware, contains a vulnerability in the Core component that can be exploited over HTTP. An attacker with a low-privileged account and network access can compromise the product, and successful attacks can lead to a takeover of Oracle Service Bus. The CVSS 3.1 base score is 8.8, and the CWE is CWE-200 (information exposure), which may understate the impact.
Affected
- Oracle Service Bus 12.2.1.4.0
- Oracle Service Bus 14.1.2.0.0
Fixed in
Unknown. Oracle's October 2026 Critical Patch Update (Rev 2) is reported to address this CVE, but the patch identifiers and fixed versions could not be verified from the Oracle advisory.
- Version 14.1.2.1.0 is mentioned in a third-party article for other CVEs in the same CPU and is unverified for this CVE.
Workaround
Unknown. No workaround is provided by the vendor.
- Restrict network access to the Oracle Service Bus HTTP interfaces and admin consoles to trusted sources until patched.
Exploitation
- Not listed in CISA's Known Exploited Vulnerabilities catalogue.
- CISA SSVC data: exploitation none, automatable no, technical impact total.
- No public proof of concept found. This means no reports were found, not that none exists.
- EPSS score: not found.
Our recommendation
- Inventory all Oracle Service Bus instances and their network exposure.
- Apply the Oracle October 2026 Critical Patch Update to all affected instances and verify the fixed version in the Oracle advisory.
- Restrict and monitor HTTP access to Oracle Service Bus until patched.
- Review access logs for unexpected activity and review low-privileged and shared accounts.
- Patch all Oracle Service Bus instances, including those tied to CVE-2026-87364, CVE-2026-87419 and CVE-2026-87369.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle Security Alert: October 2026 Critical Patch Update www.oracle.com
- Oracle Security Alerts index www.oracle.com
- Vulners NVD record CVE-2026-87359 vulners.com
- OpenCVE CVE-2026-87359 app.opencve.io
- Strix CVE-2026-87359 www.strix.ai
- Vulners Oracle CPU October 2026 vulners.com
- Cyberpress: Oracle October 2026 security update cyberpress.org
- Oracle Security Blog: October 2026 CPU released blogs.oracle.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 11:41.
Original description (NVD)
Vulnerability in the Oracle Service Bus product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Service Bus. Successful attacks of this vulnerability can result in takeover of Oracle Service Bus. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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