Oracle Siebel CRM Deployment: Missing authentication allows takeover
Summary
Oracle Siebel CRM Deployment (Server Infrastructure component), versions 17.0 to 26.9, contains a vulnerability classified as missing authentication (CWE-306). A remote attacker with a low-privileged account and network access via HTTP can compromise the server, with high impact on confidentiality, integrity and availability. The CNA record rates it CVSS 3.1 8.8; VulDB rates it 6.3 with CWE-269, so the scoring differs between sources.
Affected
- Oracle Siebel CRM Deployment, Server Infrastructure component, versions 17.0 to 26.9 (per Oracle CNA record)
- Exact fixed build: Unknown.
Fixed in
- Unknown. Check the Oracle Security Alert October 2026 (CPU) for the patch for your release.
- Do not assume that version 26.9 or later is fixed.
Workaround
- No official Oracle workaround found.
- Generic, unofficial advice: restrict HTTP access to the Siebel server to trusted IP ranges using firewall rules or ACLs.
Exploitation
- Not listed in the CISA KEV catalog. Known exploitation: Not found.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- Public proof of concept: None found in our searches.
Our recommendation
- Check whether any Siebel CRM Deployment instance exists in your environment and determine its exact version.
- Apply the fixed build from the Oracle October 2026 CPU once the fixed version is verified on the Oracle page.
- Until patched, limit HTTP access to the Siebel server to trusted sources and review low-privileged accounts.
- Patch the whole October 2026 CPU, as other Siebel Deployment CVEs are listed in it.
- Monitor the NVD and KEV status for changes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle Critical Patch Update October 2026 www.oracle.com
- Strix CVE record CVE-2026-91442 www.strix.ai
- VulDB entry 424177 vuldb.com
- OpenCVE CVE-2026-91442 app.opencve.io
- Vulners CVE-2026-91442 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 31 Oct 2026, 11:27.
Original description (NVD)
Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-26.9. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in takeover of Siebel CRM Deployment. 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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