# CVE-2026-46544: Information disclosure in UFO

> An authenticated attacker can predict session IDs to retrieve stale task results from other users in the Microsoft UFO automation framework.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **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:** 27 May 2026
- **Updated:** 28 May 2026

## What is CVE-2026-46544?

CVE-2026-46544 is a medium-severity vulnerability in microsoft UFO, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO accepts client-supplied session_id values in WebSocket task messages and reuses an existing in-memory session object if that session_id already exists. If a prior session has completed and remains in memory with populated results, a different authenticated client can send a new TASK message using the same session_id. The server re-enters the existing session object and sends the stale stored result to the new requester through the normal send_task_end() callback path. This is an authenticated cross-client stale result replay issue. The issue requires that the attacker knows or can predict a live or recently completed session_id.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-46544?


## How do I fix CVE-2026-46544?

No fix has been published for CVE-2026-46544 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-46544 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46544 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46544 and fix it if it is affected.

What it is: CVE-2026-46544 is a medium-severity vulnerability in microsoft UFO, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46544 exists.

Affected product: microsoft UFO. 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-2026-46544/ (Markdown: https://insights.sbomify.com/CVE-2026-46544/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46544
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46544
- OSV: https://osv.dev/vulnerability/CVE-2026-46544

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-46544/
Summaries are generated and may contain mistakes; the official description above is the record.