CVE-2026-108711CWE-863broken-access-control

CVE-2026-108711

Medium · published October 11, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
19.1
In the wild
Unconfirmed
What it 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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
5.3 · 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
EPSS
0.00277 · 19.1th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-10-11T17:17Z
References (6)
https://github.com/plastic-labs/honcho · [email protected]https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/crud/workspace.py#L112-L119 · [email protected]https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/routers/workspaces.py#L41-L72 · [email protected]https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/security.py#L218-L225 · [email protected]https://hackmd.io/@haind/honcho-scoped-jwt-workspace-config-disclosure · [email protected]https://www.vulncheck.com/advisories/plastic-labs-honcho-through-3.3.0-incorrect-authorization-via-post-v3-workspaces · [email protected]
EPSS history
Timeline
  • 13 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 11 OCT 12:19Z
    Plastic Labs Honcho through 3.3.0 Incorrect Authorization via POST /v3/workspaces
    cvelistv5
  • 11 OCT 12:19Z
    Plastic Labs Honcho through 3.3.0 Incorrect Authorization via POST /v3/workspaces
    cvelistv5