# CVE-2025-12779: Information disclosure in Amazon WorkSpaces

> A local attacker can extract another user's authentication token from the Amazon WorkSpaces Linux client to access their WorkSpace.

- **Severity:** High 8.8 (`CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Nov 2025
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-mcg2-rcmm-mhww

## What is CVE-2025-12779?

CVE-2025-12779 is a high-severity vulnerability in Amazon WorkSpaces, published on 5 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper handling of the authentication token in the Amazon WorkSpaces client for Linux, versions 2023.0 through 2024.8, may expose the authentication token for DCV-based WorkSpaces to other local users on the same client machine. Under certain circumstances, a local user may be able to extract another local user's authentication token from the shared client machine and access their WorkSpace.

To mitigate this issue, users should upgrade to the Amazon WorkSpaces client for Linux version 2025.0 or later.

Weakness: CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere)

## Which versions are affected by CVE-2025-12779?


## How do I fix CVE-2025-12779?

No fix has been published for CVE-2025-12779 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-12779 being exploited?

There is no known exploitation of CVE-2025-12779 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-12779 and fix it if it is affected.

What it is: CVE-2025-12779 is a high-severity vulnerability in Amazon WorkSpaces, published on 5 Nov 2025. 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-2025-12779 in the wild and no public exploit code.

Affected product: Amazon WorkSpaces. 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-2025-12779/ (Markdown: https://insights.sbomify.com/CVE-2025-12779/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-12779
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12779
- OSV: https://osv.dev/vulnerability/CVE-2025-12779

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-12779/
Summaries are generated and may contain mistakes; the official description above is the record.