---
id: CVE-2026-108711
title: >-
  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
summary: >-
  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…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-863
published: '2026-10-11'
updated: '2026-10-11'
sourceUpdated: '2026-10-11T13:17:13.877'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108711'
references:
  - url: 'https://github.com/plastic-labs/honcho'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/crud/workspace.py#L112-L119
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/routers/workspaces.py#L41-L72
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/security.py#L218-L225
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@haind/honcho-scoped-jwt-workspace-config-disclosure'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/plastic-labs-honcho-through-3.3.0-incorrect-authorization-via-post-v3-workspaces
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-11T13:51:17.024Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.