Oracle Service Bus: Improper access control allows takeover via HTTP
Summary
Oracle Service Bus 14.1.2.0.0, Oracle's integration middleware in Oracle Fusion Middleware, contains a flaw in the Core component caused by improper access control. An attacker with network access via HTTP and a low-privileged account can compromise the product, with a possible takeover affecting confidentiality, integrity and availability. No user interaction is required. Exploitation is not reported and no public proof of concept was found.
Affected
- Oracle Service Bus 14.1.2.0.0 (per CVE record)
- 12.2.1.4.0: unverified, check Oracle's October 2026 CPU matrix
Fixed in
Unknown. Check the Oracle Critical Patch Update Advisory for October 2026 (Service Bus entry) and My Oracle Support (Doc ID CPU289).
Workaround
- Unknown. No vendor workaround found in the sources. Confirm in the Oracle advisory and My Oracle Support.
Exploitation
- Not reported in the wild.
- Not listed in CISA KEV as of 21 October 2026 (not directly re-checked).
- No public proof of concept found.
Our recommendation
- Patch Oracle Service Bus 14.1.2.0.0 as a priority once the fixed release is confirmed in Oracle's advisory. If Service Bus is in use and reachable, patch in the next maintenance window.
- Check whether Service Bus is used, including through ERP or integration partners, and whether 12.2.1.4.0 is in use.
- Restrict network access to Service Bus HTTP endpoints and consoles to internal networks or VPN.
- Audit low-privilege accounts and remove unneeded ones.
- Review logs for unexpected access.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle Critical Patch Update Advisory October 2026 www.oracle.com
- NVD record CVE-2026-87420 (Vulners) vulners.com
- OpenCVE CVE-2026-87420 app.opencve.io
- Strix CVE-2026-87420 www.strix.ai
- Oracle Security Blog: October 2026 CPU released blogs.oracle.com
- Brandefense: Oracle October 2026 CPU brandefense.io
- eSecurityPlanet: Oracle October 2026 CPU www.esecurityplanet.com
- Breach-Signal: Oracle October 2026 CPU breach-signal.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, 11:37.
Original description (NVD)
Vulnerability in the Oracle Service Bus product of Oracle Fusion Middleware (component: Core). The supported version that is affected is 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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.