Plastic Labs Honcho up to 3.3.0 Workspace /v3/workspaces get_or_create_workspace improper authorization

Summaryinfo

A vulnerability was found in Plastic Labs Honcho up to 3.3.0. It has been rated as problematic. Impacted is the function get_or_create_workspace of the file /v3/workspaces of the component Workspace. Performing a manipulation results in improper authorization. This vulnerability is cataloged as CVE-2026-108711. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in Plastic Labs Honcho up to 3.3.0. This affects the function get_or_create_workspace of the file /v3/workspaces of the component Workspace. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at hackmd.io. This vulnerability is uniquely identified as CVE-2026-108711 since 10/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/11/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Plastic Labs

Name

• Honcho

Version

• 3.0
• 3.1
• 3.2
• 3.3.0

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