CVE-2026-33640CRITICAL 9.8EPSS p36.8%

CVE-2026-33640CVE-2026-33640

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.47% probability of exploitation · percentile 36.8% · 2026-06-19T12:03:05Z
Published2026-03-26
Last modified2026-03-31

Underlying weaknesses· 1

CWE-307

References

  1. https://github.com/outline/outline/releases/tag/v1.6.0
  2. https://github.com/outline/outline/security/advisories/GHSA-cwhc-53hw-qqx6

1

TypeTargetConfidenceTier
WeaknessImproper Restriction of Excessive Authentication Attemptscwe-3070%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.