# CVE-2026-83186: Missing authorization in Oracle Common Applications Calendar

> Low-privileged attackers can modify or delete critical data and cause partial denial of service in Oracle Common Applications Calendar via HTTP.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-gfcg-8qfg-gwfq

## What is CVE-2026-83186?

CVE-2026-83186 is a high-severity missing authorization vulnerability in Oracle Common Applications Calendar, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Vulnerability in the Oracle Common Applications Calendar product of Oracle E-Business Suite (component: Applications Calendar).  Supported versions that are affected are 12.2.3-12.2.15. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Common Applications Calendar.  Successful attacks of this vulnerability can result in  unauthorized creation, deletion or modification access to critical data or all Oracle Common Applications Calendar accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Common Applications Calendar. CVSS 3.1 Base Score 7.1 (Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L).

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-83186?


## How do I fix CVE-2026-83186?

No fix has been published for CVE-2026-83186 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-83186 being exploited?

There is no known exploitation of CVE-2026-83186 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-83186 and fix it if it is affected.

What it is: CVE-2026-83186 is a high-severity missing authorization vulnerability in Oracle Common Applications Calendar, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-83186 in the wild and no public exploit code.

Affected product: Oracle Common Applications Calendar. 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-2026-83186/ (Markdown: https://insights.sbomify.com/CVE-2026-83186/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-83186
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-83186
- OSV: https://osv.dev/vulnerability/CVE-2026-83186

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-83186/
Summaries are generated and may contain mistakes; the official description above is the record.