CVE-2026-108711
Plastic Labs Honcho through 3.3.0 Incorrect Authorization via POST /v3/workspaces
- State
- Published
- Severity
- 5.3 Medium
- Published
- Oct 11, 2026
- Updated
- Oct 13, 2026
- Reserved
- Oct 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N | VulnCheck |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
honchoPlastic Labs |
|
References
- https://hackmd.io/@haind/honcho-scoped-jwt-workspace-config-disclosurethird-party-advisory
- https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/routers/workspaces.py#L41-L72technical-description
- https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/security.py#L218-L225technical-description
- https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/crud/workspace.py#L112-L119technical-description
- https://github.com/plastic-labs/honchoproduct
- VulnCheck Advisory: Plastic Labs Honcho through 3.3.0 Incorrect Authorization via POST /v3/workspacesthird-party-advisory
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