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I. Basic Information for CVE-2026-33640
Vulnerability Information

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Vulnerability Title
Outline has a rate limit bypass that allows brute force of email login OTP
Source: NVD (National Vulnerability Database)
Vulnerability Description
Outline is a service that allows for collaborative documentation. Outline implements an Email OTP login flow for users not associated with an Identity Provider. Starting in version 0.86.0 and prior to version 1.6.0, Outline does not invalidate OTP codes based on amount or frequency of invalid submissions, rather it relies on the rate limiter to restrict attempts. Consequently, identified bypasses in the rate limiter permit unrestricted OTP code submissions within the codes lifetime. This allows attackers to perform brute force attacks which enable account takeover. Version 1.6.0 fixes the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
过多认证尝试的限制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Outline 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Outline是Outline开源的一个知识库。 Outline 0.86.0至1.6.0版本存在安全漏洞,该漏洞源于未基于无效提交数量或频率使OTP代码失效,可能导致暴力破解攻击和账户接管。
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 >= 0.86.0, < 1.6.0 -
II. Public POCs for CVE-2026-33640
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III. Intelligence Information for CVE-2026-33640
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IV. Related Vulnerabilities
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