# CVE-2026-83021: Auth bypass in Oracle WebLogic Server

> Unauthenticated attackers can bypass authentication to take over Oracle WebLogic Server via HTTP, leading to full system compromise.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-g2wh-mcrv-5m76

## What is CVE-2026-83021?

CVE-2026-83021 is a critical authentication bypass vulnerability in Oracle Weblogic Server, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Container).  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 WebLogic Server.  While the vulnerability is in Oracle WebLogic Server, attacks may significantly impact additional products (scope change).  Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.1 Base Score 10.0 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

Weakness: CWE-306 (Missing Authentication for Critical Functionality), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-83021?

It affects 1 product.


Products: Oracle Weblogic Server.

## How do I fix CVE-2026-83021?

No fix has been published for CVE-2026-83021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-83021 being exploited?

There is no known exploitation of CVE-2026-83021 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Weblogic Server

- [CVE-2020-14750](https://insights.sbomify.com/CVE-2020-14750/): Oracle WebLogic Server Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2020-14882](https://insights.sbomify.com/CVE-2020-14882/): Oracle WebLogic Server Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2020-14644](https://insights.sbomify.com/CVE-2020-14644/): Oracle WebLogic Server Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2020-2883](https://insights.sbomify.com/CVE-2020-2883/): Oracle WebLogic Server Unspecified (critical 9.8, exploited in the wild)
- [CVE-2020-2551](https://insights.sbomify.com/CVE-2020-2551/): Oracle Fusion Middleware Unspecified (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-83021 and fix it if it is affected.

What it is: CVE-2026-83021 is a critical authentication bypass vulnerability in Oracle Weblogic Server, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-83021 in the wild and no public exploit code.

Affected product: Oracle Weblogic Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-83021/ (Markdown: https://insights.sbomify.com/CVE-2026-83021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-83021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-83021
- OSV: https://osv.dev/vulnerability/CVE-2026-83021

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-83021/
Summaries are generated and may contain mistakes; the official description above is the record.