Oracle Outside In Technology: Takeover via crafted file processing (CVE-2026-91483)
Summary
Oracle Outside In Technology, a set of SDK libraries for parsing, viewing and converting document formats, is affected in version 8.5.8 (Outside In Core component). An attacker who already has a foothold on the host where the product runs can, with a user opening a crafted file, take over the affected Outside In Technology component with high impact on confidentiality, integrity and availability. CVSS 3.1 base score is 7.8 (High). Exploitation is not known; CISA SSVC lists exploitation as none and not automatable.
Affected
- Oracle Outside In Technology 8.5.8 (Oracle Fusion Middleware, component Outside In Core)
- Other versions: Unknown.
Fixed in
- Fixed in Oracle Critical Patch Update October 2026 (released 20 October 2026).
- Exact patch number and fixed version for 8.5.8: Unknown.
Workaround
- Unknown. No vendor workaround found in the sources.
- Until patched, limit which users and services can run Outside In-based components on affected systems (own recommendation, not from the vendor).
Exploitation
- Not listed in CISA KEV.
- CISA SSVC (ADP Vulnrichment): exploitation none, automatable no, technical impact total.
- No public proof of concept found.
- No reports of exploitation in the wild found.
Our recommendation
- Check whether any software in your environment embeds Oracle Outside In, especially tools for document handling, archiving or mail; ask the vendors.
- Patch affected Oracle products and vendor products with the October 2026 CPU once the fixed version is confirmed in the Oracle advisory.
- Patch Oracle middleware in use first.
- Restrict local logons and file-opening rights on hosts with such tools; monitor for suspicious document-triggered process activity.
- Priority: medium.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle October 2026 Critical Patch Update advisory www.oracle.com
- Oracle blog: October 2026 Critical Patch Update released blogs.oracle.com
- OpenCVE CVE-2026-91483 app.opencve.io
- VulDB CVE-2026-91483 vuldb.com
- Vulners CVE-2026-91483 vulners.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 1 Nov 2026, 23:12.
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 logon to the infrastructure where Oracle Outside In Technology executes to compromise Oracle Outside In Technology. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in takeover of Oracle Outside In Technology. CVSS 3.1 Base Score 7.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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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