Summary
| Vulnerability Name | Authentication Bypass in Oracle WebLogic Server Proxy Plug-in (CVE-2026-21962) |
| Released on | January 22, 2026 |
| Affected Component | WebLogic Server Proxy Plug-in |
| Affected Version |
Oracle HTTP Server: 12.2.1.4.0, 14.1.1.0.0, and 14.1.2.0.0
WebLogic Server Proxy Plug-in for Apache: 12.2.1.4.0, 14.1.1.0.0, and 14.1.2.0.0
WebLogic Server Proxy Plug-in for IIS: 12.2.1.4.0
|
| Vulnerability Type | Authentication bypass |
| Exploitation Condition |
1. User authentication: not required.
2. Precondition: default configurations.
3. Trigger mode: remote.
|
| Impact |
Exploitation difficulty: easy. Unauthorized attackers can exploit this vulnerability to bypass authentication.
Severity: critical. This vulnerability can result in authentication bypass.
|
| Official Solution | Available |
About the Vulnerability
Component Introduction
WebLogic Server Proxy Plug-in is a module installed on web servers such as Apache and IIS. It serves as a frontend gateway, and can intelligently forward HTTP and HTTPS requests from clients to backend WebLogic Server cluster instances through load balancing. This enables high availability, security isolation, and scalable performance.
Vulnerability Description
On January 22, 2026, Sangfor FarSight Labs received notification of the authentication bypass vulnerability in Oracle WebLogic Server Proxy Plug-in (CVE-2026-21962), classified as critical in threat level.
Specifically, WebLogic Server Proxy Plug-in contains an authentication bypass vulnerability. The plug-in fails to adequately authenticate the identities and permissions of visitors when parsing or forwarding requests from a frontend web server. Unauthenticated remote attackers can exploit this vulnerability by crafting special HTTP requests to obtain access permissions equivalent to those of the plug-in itself. Upon successful exploitation, attackers can perform arbitrary operations on the backend data and features accessible to the plug-in without authorization, leading to privilege escalation and critical data leakage.
Affected Versions
The following WebLogic Server Proxy Plug-in versions are affected:
Oracle HTTP Server: 12.2.1.4.0, 14.1.1.0.0, and 14.1.2.0.0
WebLogic Server Proxy Plug-in for Apache: 12.2.1.4.0, 14.1.1.0.0, and 14.1.2.0.0
WebLogic Server Proxy Plug-in for IIS: 12.2.1.4.0
Solutions
Remediation Solutions
Official Solutions
Security patches have been officially released to fix the vulnerability. Affected users are advised to patch the vulnerability based on the following link:
https://www.oracle.com/security-alerts/cpujan2026.html
Temporary Solutions
- Disable unused functional modules to reduce attack entry points.
- Follow the principle of least privilege to strictly control the scope of permissions for sensitive operations.
- Do not expose services to the Internet unless necessary, to limit the access sources to trusted ranges.
- Regularly update the system and components to secure versions so that known vulnerabilities can be patched at the earliest opportunity.
Sangfor Solutions
Proactive Vulnerability Detection
The following Sangfor service can proactively detect CVE-2026-21962 vulnerabilities and quickly identify vulnerability risks in batches in business scenarios:
- Athena Managed Detection and Response (MDR): The corresponding detection solution will be released on May 30, 2026. The rule ID is SF-2026-01004.
- Athena Extended Detection and Response (XDR): The corresponding detection solution will be released on January 28, 2026. The rule ID is SF-2026-00434.
Vulnerability Monitoring
The following Sangfor services support CVE-2026-21962 vulnerability monitoring, and can quickly identify affected assets and the impact scope in business scenarios in real time through traffic collection:
- Athena Network Detection and Response (NDR): The corresponding monitoring solution will be released on January 26, 2026. The rule ID is 11228003.
- MDR: The corresponding monitoring solution will be released on January 26, 2026. The rule ID is 11228003. In this case, make sure that Athena MDR is integrated with Athena NDR.
- Athena XDR: The corresponding monitoring solution will be released on January 26, 2026. The rule ID is 11228003.
- Sangfor Traffic Monitoring GPT: Sangfor Traffic Monitoring GPT can detect attacks and threats targeting this vulnerability based on its understanding of attacks and code, without the need to configure rules.
Vulnerability Prevention
The following Sangfor services can effectively block CVE-2026-21962 exploits:
- Athena Next-Generation Firewall (NGFW): The corresponding prevention solution will be released on January 26, 2026. The rule ID is 11228003.
- Sangfor Web Application Firewall (WAF): The corresponding prevention solution will be released on January 26, 2026. The rule ID is11228003.
- Athena MDR: The corresponding prevention solution will be released on January 26, 2026. The rule ID is 11228003. In this case, make sure that Athena MDR is integrated with Athena NGFW.
- Athena XDR: The corresponding prevention solution will be released on January 26, 2026. The rule ID is 11228003. In this case, make sure that Athena XDR is integrated with Athena NGFW.
Timeline
On January 22, 2026, Sangfor FarSight Labs received notification of the authentication bypass vulnerability in Oracle WebLogic Server Proxy Plug-in (CVE-2026-21962).
On January 22, 2026, Sangfor FarSight Labs released a vulnerability alert.
Reference
https://www.oracle.com/security-alerts/cpujan2026.html
Learn More
Sangfor FarSight Labs researches the latest cyber threats and unknown zero-day vulnerabilities, alerting customers to potential dangers to their organizations, and providing real-time solutions with actionable intelligence. Sangfor FarSight Labs works with other security vendors and the security community at large to identify and verify global cyber threats, providing fast and easy protection for customers.
