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.

INFO

Published Date :

2026-03-26T20:56:37.818Z

Last Modified :

2026-03-26T20:56:37.818Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-33640 vulnerability.

Vendors Products
Getoutline
  • Outline
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33640.

URL Resource
https://github.com/outline/outline/releases/tag/v1.6.0 cve-icon cve-icon
https://github.com/outline/outline/security/advisories/GHSA-cwhc-53hw-qqx6 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Privileges Required
User Interaction
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SS Confidentiality
SS Integrity
SS Availability