CVE-2026-43886
HighSummary
Outline is a service that allows for collaborative documentation. From versions 0.84.0 to 1.6.1, a logic error in OAuthInterface.validateScope() allows the entire scope array to be accepted if any single scope is valid.
Risk Assessment
An attacker can exploit this vulnerability to gain full API access, including write, delete, and admin operations, posing a serious threat to the organization's data security.
Recommendation
It is recommended to upgrade to version 1.7.0 or later to mitigate this vulnerability.
Other vulnerabilities in Outline
See all- CVE-2026-43887High
Outline is a service that allows for collaborative documentation. From versions 0.84.0 to 1.6.1, the comment section permits users to mention other users; however, the backend does not validate or sanitize the href attribute associated with these mentions, potentially leading to client-side code execution.
- CVE-2026-41649High
Outline versions 0.86.0 through 1.7.0 contain an insecure direct object reference (IDOR) vulnerability in the `shares.create` API endpoint. When both `collectionId` and `documentId` are provided in the request, the authorization logic only checks access to the collection, ignoring the document. This allows an authenticated attacker to generate a valid public share link for any document on the platform, including documents from other workspaces.
Original NVD description (English source)
Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, a logic error in OAuthInterface.validateScope() uses Array.some() to validate requested OAuth scopes, causing the function to accept the entire scope array if any single scope is valid. An attacker can smuggle the wildcard * scope by requesting scope=read *, escalating a read-only OAuth token to full unrestricted API access including write, delete, and admin operations. This vulnerability is fixed in 1.7.0.