# CVE-2026-46840: Auth bypass in Oracle REST Data Services

> Unauthenticated attackers can take over Oracle REST Data Services via network access, 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:** 28 May 2026
- **Updated:** 29 May 2026
- **Also known as:** GHSA-2gr4-fx2q-v5vq

## What is CVE-2026-46840?

CVE-2026-46840 is a critical authentication bypass vulnerability in Oracle REST Data Services, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vulnerability in Oracle REST Data Services (component: Backend-as-a-Service).  Supported versions that are affected are 24.2.0-26.1.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTPS to compromise Oracle REST Data Services.  While the vulnerability is in Oracle REST Data Services, attacks may significantly impact additional products (scope change).  Successful attacks of this vulnerability can result in takeover of Oracle REST Data Services. 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), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-46840?

It affects 1 product.


Products: Oracle Rest Data Services.

## How do I fix CVE-2026-46840?

No fix has been published for CVE-2026-46840 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-46840 being exploited?

There is no known exploitation of CVE-2026-46840 in the wild and no public exploit code.

## Other vulnerabilities in Oracle REST Data Services

- [CVE-2026-46775](https://insights.sbomify.com/CVE-2026-46775/): Denial of service in Oracle REST Data Services (critical 9.9)
- [CVE-2026-46839](https://insights.sbomify.com/CVE-2026-46839/): Auth bypass in Oracle REST Data Services (critical 9.9)
- [CVE-2026-35277](https://insights.sbomify.com/CVE-2026-35277/): Missing authorization in Oracle REST Data Services (high 8.1)
- [CVE-2026-35266](https://insights.sbomify.com/CVE-2026-35266/): Cross-site request forgery in Oracle REST Data Services (high 7.9)
- [CVE-2026-46829](https://insights.sbomify.com/CVE-2026-46829/): Denial of service in Oracle REST Data Services (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46840 and fix it if it is affected.

What it is: CVE-2026-46840 is a critical authentication bypass vulnerability in Oracle REST Data Services, published on 28 May 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-2026-46840 in the wild and no public exploit code.

Affected product: Oracle REST Data Services. 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-2026-46840/ (Markdown: https://insights.sbomify.com/CVE-2026-46840/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46840
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46840
- OSV: https://osv.dev/vulnerability/CVE-2026-46840

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46840/
Summaries are generated and may contain mistakes; the official description above is the record.