CVE-2026-125330

HarnessRouter: A workspace's API key could read and change sessions, files and responses of other workspaces in the same organization

Published Nov 10, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
HarnessRouter is a self-hosted unified API for agent harnesses. From version 0.4.2 until 0.31.7, routes that accept a session ID or response ID validate only the caller's organization and do not enforce the workspace scope of a non-default workspace API key. A key holder who learns a non-guessable identifier from another workspace in the same organization can read sessions, conversation turns, files, traces, and responses, overwrite files, cancel or delete sessions, and publish share links. The issue does not cross organization boundaries, and console users, organization keys, and Default Workspace keys intentionally retain organization-wide access. This issue is fixed in version 0.31.7.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
First Time appeared Harnessrouter
Harnessrouter harnessrouter
Vendors & Products Harnessrouter
Harnessrouter harnessrouter
Type Values Removed Values Added
Description HarnessRouter is a self-hosted unified API for agent harnesses. From version 0.4.2 until 0.31.7, routes that accept a session ID or response ID validate only the caller's organization and do not enforce the workspace scope of a non-default workspace API key. A key holder who learns a non-guessable identifier from another workspace in the same organization can read sessions, conversation turns, files, traces, and responses, overwrite files, cancel or delete sessions, and publish share links. The issue does not cross organization boundaries, and console users, organization keys, and Default Workspace keys intentionally retain organization-wide access. This issue is fixed in version 0.31.7.
Title HarnessRouter: A workspace's API key could read and change sessions, files and responses of other workspaces in the same organization
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 10, 2026, 6:36 PM
Reserved
Nov 9, 2026, 9:22 PM
Status
Deferred
Published
Nov 10, 2026, 7:21 PM
Modified
Nov 12, 2026, 10:18 PM