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CVE-2026-54573— Authorization Bypass in API Key/OAuth Scopes via Path Parsing Discrepancy

Quick assessment

Affected
outline outline
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Outline是美国Outline基金会开源的一个知识库。 Outline 1.8.0之前版本存在授权问题漏洞，该漏洞源于AuthenticationHelper.canAccess函数未能正确去除URL片段(#)，可能导致权限低的攻击者通过添加包含允许路径的URL片段绕过API密钥范围限制，从而导致权限提升。

AI Predicted 9.8 Difficulty: Easy EPSS 0.50% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
outline outline < 1.8.0 affected
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I. Basic Information for CVE-2026-54573

Vulnerability Information
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Vulnerability Title
Authorization Bypass in API Key/OAuth Scopes via Path Parsing Discrepancy
Source: CVE Program / CVE List V5
Vulnerability Description
Outline is a service that allows for collaborative documentation. Prior to 1.8.0, the AuthenticationHelper.canAccess function uses ctx.originalUrl to verify if an API key or OAuth token has the required scopes for a request. It extracts the resource by splitting the URL by / and taking the last segment. However, it fails to strip the URL fragment (#). Because Koa's router uses ctx.path (which strips the fragment) for routing, an attacker can append a fragment containing a permitted path (e.g., #foo/api/documents.info) to a restricted endpoint (e.g., /api/documents.create). The router will route the request to the restricted endpoint, but canAccess will evaluate the permitted path in the fragment, bypassing the API key scope restrictions and allowing privilege escalation. This vulnerability is fixed in 1.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Outline 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Outline是美国Outline基金会开源的一个知识库。 Outline 1.8.0之前版本存在授权问题漏洞，该漏洞源于AuthenticationHelper.canAccess函数未能正确去除URL片段(#)，可能导致权限低的攻击者通过添加包含允许路径的URL片段绕过API密钥范围限制，从而导致权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
outline outline < 1.8.0 -

II. Public POCs for CVE-2026-54573

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III. Intelligence Information for CVE-2026-54573

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Vendor Advisories for CVE-2026-54573 (1)

IV. Related Vulnerabilities

Same product: outline
Same vendor: outline
Same weakness: CWE-863

V. Comments for CVE-2026-54573

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