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Critical severity9.8NVD Advisory· Published Mar 26, 2026· Updated Jun 17, 2026

CVE-2026-33640

CVE-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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Outline/Outline3 versions
    cpe:2.3:a:getoutline:outline:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:getoutline:outline:*:*:*:*:*:*:*:*range: >=0.86.0,<1.6.0
    • (no CPE)range: >=0.86.0,<1.6.0
    • (no CPE)range: >= 0.86.0, < 1.6.0

Patches

Vulnerability mechanics

References

2

News mentions

0

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CVE-2026-33640 · Critical · VYPR