CVE-2026-21962

Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in Improper Access Control Vulnerability

Actively exploited (CISA KEV) Critical 10.0 CVSS 3.1

Description

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).

Description as published by the source, in English.

Key facts

Published: 2026-01-20
Last modified: 2026-08-25
Assigned by: secalert_us@oracle.com
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Scored by: secalert_us@oracle.com
Probability of exploitation: 42.7 % higher than 99 % of all known vulnerabilities
EPSS, next 30 days, model v2026.06.15
Fix available: Yes, see references

Actively exploited

CISA added this vulnerability to the Known Exploited Vulnerabilities catalogue on 2026-08-24, with a remediation deadline of 2026-08-27 for US federal agencies.

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.

Affected products

Vendor	Product	Versions	Status
Oracle	Http Server	12.2.1.4.0	Affected
Oracle	Http Server	14.1.1.0.0	Affected
Oracle	Http Server	14.1.2.0.0	Affected
Oracle	Weblogic Server Proxy Plug-in	12.2.1.4.0	Affected
Oracle	Weblogic Server Proxy Plug-in	14.1.1.0.0	Affected
Oracle	Weblogic Server Proxy Plug-in	14.1.2.0.0	Affected

Weakness type

CWE-284: Improper Access Control
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack techniques

Derived through the weakness type: CVE to CWE to CAPEC to ATT&CK. This shows which techniques the weakness class is historically used for. It does not assert that this vulnerability has been exploited that way.

T1014: Rootkit stealth
T1027.009: Embedded Payloads stealth
T1037: Boot or Logon Initialization Scripts persistence, privilege-escalation
T1080: Taint Shared Content lateral-movement
T1505.005: Terminal Services DLL persistence
T1542.003: Bootkit stealth, persistence
T1543: Create or Modify System Process persistence, privilege-escalation
T1543.001: Launch Agent persistence, privilege-escalation
T1543.003: Windows Service persistence, privilege-escalation
T1543.004: Launch Daemon persistence, privilege-escalation
T1546.001: Change Default File Association privilege-escalation, persistence
T1546.004: Unix Shell Configuration Modification privilege-escalation, persistence
T1546.008: Accessibility Features privilege-escalation, persistence
T1546.016: Installer Packages privilege-escalation, persistence
T1547: Boot or Logon Autostart Execution persistence, privilege-escalation
T1547.006: Kernel Modules and Extensions persistence, privilege-escalation
T1553.004: Install Root Certificate defense-impairment
T1556.006: Multi-Factor Authentication defense-impairment, persistence, credential-access
T1574.011: Services Registry Permissions Weakness stealth, execution

References

https://www.oracle.com/security-alerts/cpujan2026.html Patch, Vendor Advisory
https://github.com/Ashwesker/Ashwesker-CVE-2026-21962/issues/1 Broken Link, Not Applicable
https://web.archive.org/web/20260129165916/https://github.com/Ashwesker/Ashwesker-CVE-202… Issue Tracking
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21962 US Government Resource
https://x.com/0xacb/status/2015473216844620280 Not Applicable

Related at Berigo

Articles

Attackers are exploiting the plug-in in front of Oracle WebLogic Mentions this CVE 2026-08-25
CISA added CVE-2026-21962 to its Known Exploited Vulnerabilities Catalog on 24 August, citing evidence of active exploitation. The flaw sits in Oracl…
Attacks on GeoServer began within hours of the flaw becoming public Same product 2026-08-17
A GeoServer vulnerability was made public on X on 12 August 2026, before the project had a fix ready. watchTowr states that exploitation attempts beg…
Exploitation observed of critical Oracle E-Business Suite flaw Same product 2026-06-29
Defused Cyber has observed exploitation attempts against CVE-2026-46817 in Oracle E-Business Suite Payments, a CVSS 9.8 flaw Oracle patched in May.
Oracle fixes 245 vulnerabilities in its June update Same product 2026-06-18
Oracle's quarterly update covers 245 vulnerabilities, concentrated in Fusion Middleware where 53 are exploitable without authentication.

Does this affect you?

A vulnerability matters only if you run the product, in an affected version, somewhere an attacker can reach.

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Sources and freshness

CVE

What it is: A reference number naming one specific vulnerability, for example CVE-2024-9474.
What it tells you: Which vulnerability we are talking about, and in which product.
What it does NOT tell you: Nothing about how serious it is, whether anyone is exploiting it, or whether it concerns you.
Why it matters: Without a shared number, vendor, authority and tooling cannot discuss the same flaw.
Used with the others: The number is the key. NVD, KEV and EPSS all describe the same CVE.

NVD CWE CISA KEV EPSS

How to read this together

No single value should be used on its own. A high CVSS score does not mean a vulnerability is being exploited, and a low one does not mean it is harmless. The four sources answer four different questions.

CVE names the specific vulnerability.
NVD adds severity and technical detail about it.
CWE describes the type of mistake behind it.
CISA KEV shows that it is already being exploited.
EPSS estimates how likely exploitation is soon.

The order that decides what is urgent

Do you actually have the product?
Is the version you run affected?
Is it listed in CISA KEV?
Does it have a high EPSS score?
Is the system reachable from the internet or from others?
How important is the system to the business?
Are there compensating controls already in place?

The first two questions are not about the vulnerability at all. They are about you, and they remove most of the list before you start.

A short example

Fix this week

CVSS 6,5 (medium)

In CISA KEV: yes
EPSS: 94 per cent
A firewall facing the internet

Can be scheduled

CVSS 9,8 (critical)

In CISA KEV: no
EPSS: 0,04 per cent
A test server with no internet access

Sorted by CVSS alone, the one on the right comes first. It is the more serious flaw in theory. But the one on the left is being used against real organisations right now, and it sits where an attacker can reach it. That is the one to fix first.

The critical one still has to be fixed. It just does not have to be fixed today.

This product uses the NVD API but is not endorsed or certified by the NVD. CVE and the CVE logo are registered trademarks of The MITRE Corporation; CVE records are used under the CVE Terms of Use. CWE is a trademark of The MITRE Corporation, used per the CWE Terms of Use. KEV data from CISA (CC0). Exploitation probability from EPSS, a FIRST.org project. Open-source package data from OSV and the GitHub Advisory Database (CC-BY 4.0).

Scores and vectors are shown as published by the sources. The ordering of results is Berigo's own editorial assessment, described on the search page, and is not NVD data. An empty result never means a system is safe.