PT-2026-39858 · Outline · Outline

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CVE-2026-43890

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Published

2026-05-11

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Updated

2026-05-12

CVSS v3.1

7.7

High

VectorAV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Name of the Vulnerable Software and Affected Versions Outline versions 0.84.0 through 1.7.0
Description The 'subscriptions.create' API endpoint in 'server/routes/api/subscriptions/subscriptions.ts' contains a broken authorization pattern. When both collectionId and documentId are provided in a request, the system only validates authorization for the collection branch. However, the subscriptionCreator() function in 'server/commands/subscriptionCreator.ts' creates the subscription using the documentId, which remains unvalidated. Because the schema in 'server/routes/api/subscriptions/schema.ts' allows both parameters to be sent simultaneously, an attacker can create a subscription to a document they do not have read access to on any team within the instance.
Recommendations Update to version 1.7.1.

Exploit

Fix

IDOR

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Weakness Enumeration

Related Identifiers

CVE-2026-43890
GHSA-GF8H-CV9V-Q4FW

Affected Products

Outline