CVE-2026-41649: Outline has IDOR in document share creation that allows unauthorized access to private documents across workspaces
Outline is a service that allows for collaborative documentation. The shares.create API endpoint starting in version 0.86.0 and prior to version 1.7.0 has an insecure direct object reference.. When both collectionId and documentId are provided in the request, the authorization logic only checks access to the collection, completely ignoring the document. This allows an authenticated attacker to generate a valid public share link for any document on the platform, including documents belonging to other workspaces. The full document contents can then be retrieved via the documents.info endpoint. Version 1.7.0 contains a patch.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Outline shares.create (IDOR)to a version that resolves this vulnerability.Fixed in 1.7.0 - Compensating control
Restrict access to shared document links (public share URLs) so that only authorized users can access document contents across workspaces.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-41649?
CVE-2026-41649 has a medium severity rating due to its potential for unauthorized access to private documents.
How do I mitigate CVE-2026-41649?
To mitigate CVE-2026-41649, upgrade to Outline version 1.7.0 or later.
What product is affected by CVE-2026-41649?
CVE-2026-41649 affects the Outline product versions from 0.86.0 to 1.6.9.
What type of vulnerability is CVE-2026-41649?
CVE-2026-41649 is classified as an Insecure Direct Object Reference (IDOR) vulnerability.
Can CVE-2026-41649 lead to data breaches?
Yes, CVE-2026-41649 can lead to data breaches by allowing unauthorized access to private documents across workspaces.