CVE-2026-43886 (GCVE-0-2026-43886)
Vulnerability from cvelistv5 – Published: 2026-05-11 21:06 – Updated: 2026-05-12 13:20
VLAI
EPSS
VEX
Title
Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Access
Summary
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.
Severity
8.2 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 13:20 UTC
CWE
- CWE-269 - Improper Privilege Management
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/outline/outline/security/advis… | x_refsource_CONFIRM |
Impacted products
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Sightings
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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