CVE-2026-108711
Plastic Labs Honcho through 3.3.0 Incorrect Authorization via POST /v3/workspaces
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-863 |
| Vendor | plastic labs |
| Product | honcho |
| Published | Oct 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
Plastic Labs / honcho
0 ≤ 3.3.0
References
hackmd.io: https://hackmd.io/@haind/honcho-scoped-jwt-workspace-config-disclosure github.com: https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/routers/workspaces.py#L41-L72 github.com: https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/security.py#L218-L225 github.com: https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/crud/workspace.py#L112-L119 github.com: https://github.com/plastic-labs/honcho vulncheck.com: https://www.vulncheck.com/advisories/plastic-labs-honcho-through-3.3.0-incorrect-authorization-via-post-v3-workspaces
Credits
HaiND from the Post and Telecommunication Institute of Technology