CVE-2026-28506 Outline's Information Disclosure in Activity Logs allows User Enumeration of Private Drafts

Medium 4.3 Published 17 Mar 2026 Updated 17 Mar 2026

Authenticated users can enumerate private draft IDs via activity logs, bypassing access controls and enabling further IDOR attacks.

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-2026-28506?

CVE-2026-28506 is a medium-severity vulnerability in outline, published on 17 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Outline is a service that allows for collaborative documentation. Prior to 1.5.0, the events.list API endpoint, used for retrieving activity logs, contains a logic flaw in its filtering mechanism. It allows any authenticated user to retrieve activity events associated with documents that have no collection (e.g., Private Drafts, Deleted Documents), regardless of the user's actual permissions on those documents. While the document content is not directly exposed, this vulnerability leaks sensitive metadata (such as Document IDs, user activity timestamps, and in some specific cases like the Document Title of Permanent Delete). Crucially, leaking valid Document IDs of deleted drafts removes the protection of UUID randomness, making High-severity IDOR attacks (such as the one identified in documents.restore) trivially exploitable by lowering the attack complexity. Version 1.5.0 fixes the issue.

Weakness: CWE-200

Which versions are affected by CVE-2026-28506?

It affects 1 product.

Products include Getoutline Outline.

How do I fix CVE-2026-28506?

No fix has been published for CVE-2026-28506 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-28506 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28506 exists.

Sources

Also known as GHSA-69x7-6fcr-mm6g.