CVE-2026-43886 HIGH

CVE-2026-43886: Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Access

Vendor Outline
Product outline
Weakness CWE-269
Published May 11, 2026
Last update May 12, 2026
View on NVD All CVEs

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 11, 2026 CVE published
May 12, 2026 Record updated