# CVE-2026-23811: Unauthorized Bi-Directional Traffic Interception via L2/L3 Manipulation

> Attackers can bypass client isolation and redirect traffic to perform Machine-in-the-Middle attacks on HPE Aruba wireless networks.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Mar 2026
- **Updated:** 1 Apr 2026
- **Also known as:** GHSA-99rv-pxvm-xph4

## What is CVE-2026-23811?

CVE-2026-23811 is a medium-severity vulnerability in Arubanetworks Arubaos, published on 4 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the client isolation mechanism may allow an attacker to bypass Layer 2 (L2) communication restrictions between clients and redirect traffic at Layer 3 (L3). In addition to bypassing policy enforcement, successful exploitation - when combined with a port-stealing attack - may enable a bi-directional Machine-in-the-Middle (MitM) attack.

Weakness: CWE-300 (Channel Accessible by Non-Endpoint)

## Which versions are affected by CVE-2026-23811?

It affects 1 product.


Products: Arubanetworks Arubaos.

## How do I fix CVE-2026-23811?

No fix has been published for CVE-2026-23811 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23811 being exploited?

There is no known exploitation of CVE-2026-23811 in the wild and no public exploit code.

## Other vulnerabilities in Arubanetworks Arubaos

- [CVE-2024-42393](https://insights.sbomify.com/CVE-2024-42393/): Memory corruption in Hpe Aruba Networking InstantOS and Aruba Access Points running ArubaOS 10 (critical 9.8)
- [CVE-2024-42394](https://insights.sbomify.com/CVE-2024-42394/): Memory corruption in HPE Aruba Networking InstantOS and Aruba Access Points running ArubaOS 10 (critical 9.8)
- [CVE-2024-42395](https://insights.sbomify.com/CVE-2024-42395/): Memory corruption in HPE Aruba Networking InstantOS and Aruba Access Points running ArubaOS 10 (critical 9.8)
- [CVE-2024-31466](https://insights.sbomify.com/CVE-2024-31466/): Unauthenticated Buffer Overflow Vulnerabilities in CLI Service Accessed by the PAPI Protocol (critical 9.8)
- [CVE-2024-31467](https://insights.sbomify.com/CVE-2024-31467/): Unauthenticated Buffer Overflow Vulnerabilities in CLI Service Accessed by the PAPI Protocol (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23811 and fix it if it is affected.

What it is: CVE-2026-23811 is a medium-severity vulnerability in Arubanetworks Arubaos, published on 4 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-23811 in the wild and no public exploit code.

Affected product: Arubanetworks Arubaos. 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-2026-23811/ (Markdown: https://insights.sbomify.com/CVE-2026-23811/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23811
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23811
- OSV: https://osv.dev/vulnerability/CVE-2026-23811

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23811/
Summaries are generated and may contain mistakes; the official description above is the record.