CVE-2026-21962: Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in Improper Access Control Vulnerability

In short

Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in has a weakness classified as improper access control (CWE-284). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-08-24. NVD lists CVSS 3.1 at 10 CRITICAL.

What it is

“Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in contain an improper access control vulnerability that can result in unauthorized creation, deletion or modification access to critical data as well as unauthorized access to critical data or complete access to all Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in accessible data.” — CISA KEV, retrieved 2026-11-01

“Vulnerability in the Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in product of Oracle Fusion Middleware (component: Weblogic Server Proxy Plug-in for Apache HTTP Server, Weblogic Server Proxy Plug-in for IIS). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0 and 14.1.2.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in. While the vulnerability is in Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in accessible data as well as unauthorized access to critical data or complete access to all Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in accessible data. Note: Affected version for Weblogic Server Proxy Plug-in for IIS is 12.2.1.4.0 only. CVSS 3.1 Base Score 10.0 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N).” — NVD, retrieved 2026-11-01

Who is affected

Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in. NVD lists the following versions as affected:

• Oracle HTTP Server: version 12.2.1.4.0
• Oracle HTTP Server: version 14.1.1.0.0
• Oracle HTTP Server: version 14.1.2.0.0
• Oracle Weblogic Server Proxy plug-in: version 12.2.1.4.0
• Oracle Weblogic Server Proxy plug-in: version 14.1.1.0.0
• Oracle Weblogic Server Proxy plug-in: version 14.1.2.0.0

Exploitation status

CISA KEV added: 2026-08-24. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-08-27.

Scores

NVD CVSS 3.1: 10 CRITICAL; vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N; source [email protected].

EPSS by FIRST: 73.19%; percentile 99.46; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-284.

Timeline

CISA required action

“Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.” — CISA KEV

What to do

• Confirm whether you run Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Patch, Vendor Advisory: https://www.oracle.com/security-alerts/cpujan2026.html
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.