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CVE-2026-43887— Outline: Stored XSS via Comment Mentions

CVSS 7.3 · High EPSS 0.04% · P11

Affected Version Matrix 1

VendorProductVersion RangeStatus
outlineoutline>= 0.84.0, < 1.7.0affected
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I. Basic Information for CVE-2026-43887

Vulnerability Information
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Vulnerability Title
Outline: Stored XSS via Comment Mentions
Source: NVD (National Vulnerability Database)
Vulnerability Description
Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, the Outline comment section permits users to mention other users; however, the backend does not validate or sanitize the href attribute associated with these mentions. As a result, potentially dangerous protocols (e.g., javascript:) are not filtered, introducing a risk of client-side code execution. This vulnerability is fixed in 1.7.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Outline 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Outline是Outline开源的一个知识库。 Outline 0.84.0版本至1.6.1版本存在跨站脚本漏洞，该漏洞源于评论部分允许用户提及他人，但后端未验证或清理与这些提及关联的href属性，导致潜在危险协议未被过滤，存在客户端代码执行风险。
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

VendorProductAffected VersionsCPESubscribe
outlineoutline >= 0.84.0, < 1.7.0 -

II. Public POCs for CVE-2026-43887

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III. Intelligence Information for CVE-2026-43887

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Vendor Advisories for CVE-2026-43887 (1)

Same Patch Batch · outline · 2026-05-11 · 6 CVEs total

CVE-2026-438888.7 HIGHOutline: Zip Extraction Path Escape via PATH_MAX Truncation in Collection Import
CVE-2026-438868.2 HIGHOutline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Ac
CVE-2026-438907.7 HIGHOutline: IDOR in subscriptions.create allows cross-tenant subscription on private document
CVE-2026-438896.5 MEDIUMOutline: Unauthorized Document Publication via Mixed collectionId+documentId Share
CVE-2026-446955.8 MEDIUMOutline: Slack OAuth state can link a victim Outline account to an attacker Slack identity

IV. Related Vulnerabilities

Same product: outline
Same vendor: outline
Same weakness: CWE-79

V. Comments for CVE-2026-43887

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