CVE-2026-43886
Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Access
CVSS Score
8.2
EPSS Score
0.0%
EPSS Percentile
8th
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.
| CWE | CWE-269 |
| Vendor | outline |
| Product | outline |
| Published | May 11, 2026 |
| Last Updated | May 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
None
Affected Versions
outline / outline
>= 0.84.0, < 1.7.0