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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-108711 being exploited?
There is no known exploitation of CVE-2026-108711 in the wild and no public exploit code.
Sources
Also known as GHSA-xj43-ppg4-ghf5.