Oracle HTTP Server: Compromise via WebLogic Proxy Plug-in (unauthenticated)
Summary
Oracle HTTP Server with the Oracle WebLogic Server Proxy Plug-in, part of Oracle Fusion Middleware, is affected. An unauthenticated attacker with network access via HTTP can compromise the server, which can lead to unauthorized creation, deletion or modification of data and unauthorized access to data accessible through the server. Exploitation is difficult (high attack complexity), and the impact may extend to additional products (scope change). The CVSS 3.1 base score is 8.7 (high).
Affected
- Oracle HTTP Server with Oracle WebLogic Server Proxy Plug-in, supported version 12.2.1.4.0
- Oracle HTTP Server with Oracle WebLogic Server Proxy Plug-in, supported version 14.1.2.0.0
Fixed in
Unknown. Patch IDs for the October 2026 Critical Patch Update are listed at https://www.oracle.com/security-alerts/cpuoct2026.html and must be checked there.
Workaround
Unknown. No vendor-published workaround was identified. Oracle's Critical Patch Update is the fix.
Exploitation
- No public proof of concept, in-the-wild exploitation or CISA KEV listing is known for CVE-2026-87346.
- A related CVE in the same proxy plug-in family, CVE-2026-21962, is listed in CISA KEV.
Our recommendation
- Check whether Oracle HTTP Server or the WebLogic Server Proxy Plug-in is in use, including in Oracle Fusion Middleware and ERP stacks.
- If affected and internet-facing, prioritise applying the October 2026 Oracle Critical Patch Update.
- Until patched, restrict which hosts can reach the OHS/proxy listener and limit back-end WebLogic access to the proxy.
- Monitor web server logs for anomalous HTTP requests.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle October 2026 Critical Patch Update www.oracle.com
- NVD/Vulners record CVE-2026-87346 vulners.com
- Tenable plugin 369018 www.tenable.com
- SecurityWeek: October 2026 CPU www.securityweek.com
- CISA alert on CVE-2026-21962 KEV addition www.cisa.gov
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 1 Nov 2026, 01:16.
Original description (NVD)
Vulnerability in the Oracle HTTP Server product of Oracle Fusion Middleware (component: Oracle Weblogic Server Proxy Plug-in for Oracle HTTP Server). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.0.0. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle HTTP Server. While the vulnerability is in Oracle HTTP Server, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle HTTP Server accessible data as well as unauthorized access to critical data or complete access to all Oracle HTTP Server accessible data. CVSS 3.1 Base Score 8.7 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N).
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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