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

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。

CVSS 7.3 · High EPSS 0.43% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
outline outline >= 0.84.0, < 1.7.0 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
outline outline >= 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-2026-43888 8.7 HIGH Outline: Zip Extraction Path Escape via PATH_MAX Truncation in Collection Import
CVE-2026-43886 8.2 HIGH Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Ac
CVE-2026-43890 7.7 HIGH Outline: IDOR in subscriptions.create allows cross-tenant subscription on private document
CVE-2026-43889 6.5 MEDIUM Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share
CVE-2026-44695 5.8 MEDIUM Outline: 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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