# CVE-2026-108711: Plastic Labs Honcho through 3.3.0 Incorrect Authorization via POST /v3/workspaces

> Attackers with peer or session API keys can read restricted workspace metadata and configuration by exploiting incorrect authorization checks in the Honcho API.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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:** 11 Oct 2026
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-xj43-ppg4-ghf5

## What is CVE-2026-108711?

CVE-2026-108711 is a medium-severity missing authorization vulnerability in Plastic Labs honcho, published on 11 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Plastic Labs Honcho through 3.3.0 contains an incorrect authorization vulnerability that allows peer- or session-scoped API key holders to read workspace data because get_or_create_workspace checks only the workspace claim. Attackers can submit their parent workspace name to the POST /v3/workspaces endpoint to retrieve workspace metadata and configuration, including custom_instructions, reserved for workspace or admin keys.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-108711?


## How do I fix CVE-2026-108711?

No fix has been published for CVE-2026-108711 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108711 being exploited?

There is no known exploitation of CVE-2026-108711 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108711 and fix it if it is affected.

What it is: CVE-2026-108711 is a medium-severity missing authorization vulnerability in Plastic Labs honcho, published on 11 Oct 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-2026-108711 in the wild and no public exploit code.

Affected product: Plastic Labs honcho. 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-2026-108711/ (Markdown: https://insights.sbomify.com/CVE-2026-108711/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108711
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108711
- OSV: https://osv.dev/vulnerability/CVE-2026-108711

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-108711/
Summaries are generated and may contain mistakes; the official description above is the record.