Vulnerability in Getoutline Outline
CVE-2026-33640
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 invali…
EPSS: 0.005 (37.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Getoutline Outline
- Outline — versions >= 0.86.0, < 1.6.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-33640?
- CVE-2026-33640 is a critical-severity vulnerability in Getoutline Outline, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 9.8/10. Published 2026-03-26.
- How severe is CVE-2026-33640?
- Critical severity. CVSS v3 base score is 9.8 out of 10.