Oracle Outside In Technology: Improper access control in Outside In Core
Summary
Oracle Outside In Technology 8.5.8, specifically its Outside In Core component, is affected by an improper access control flaw (CWE-284). An unauthenticated attacker with network access via HTTP can compromise the product and gain unauthorized access to critical data, with a CVSS 3.1 base score of 8.6. Because of a scope change, the impact may extend to other products that embed Outside In. NVD analysis was still pending at the time of research.
Affected
- Oracle Outside In Technology 8.5.8 (Outside In Core component)
- Software that embeds Outside In 8.5.8 is potentially affected; check with the vendor.
Fixed in
Unknown. Check the patch availability table of the Oracle Critical Patch Update Advisory, October 2026, for Outside In 8.5.8.
Workaround
Unknown. No vendor workaround was found.
- Interim measure (own recommendation, not from the vendor): limit HTTP exposure of services that process documents with Outside In.
Exploitation
- No evidence of exploitation in the wild was found.
- One aggregator lists the CVE as not in CISA KEV.
- CISA SSVC: Exploitation none, Automatable yes, Technical Impact partial.
- EPSS 0.00398 (low), per a third-party aggregator.
- No public proof of concept found.
Our recommendation
- Inventory Oracle Fusion Middleware and third-party software that embeds Outside In 8.5.8, and ask vendors for their status.
- Read the October 2026 CPU advisory, confirm the fixed build and patch systems, prioritising internet-facing and partner-facing services.
- Until patched, limit HTTP exposure of services that process files with Outside In.
- Monitor NVD and CISA KEV for updates.
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
- Strix: CVE-2026-87304 www.strix.ai
- Vulners: NVD:CVE-2026-87304 vulners.com
- Vulners: CNNVD-2026-24711536 (EPSS) vulners.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 1 Nov 2026, 07:32.
Original description (NVD)
Vulnerability in the Oracle Outside In Technology product of Oracle Fusion Middleware (component: Outside In Core). The supported version that is affected is 8.5.8. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Outside In Technology. While the vulnerability is in Oracle Outside In Technology, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Outside In Technology accessible data. CVSS 3.1 Base Score 8.6 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/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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