What is CVE-2026-43886?

CVE-2026-43886 is a high-severity vulnerability in Outline, classified under Improper Privilege Management. CVSS score: 8.2/10. Published 2026-05-11.

How severe is CVE-2026-43886?

High severity. CVSS v3 base score is 8.2 out of 10.

Privilege escalation in Outline

CVE-2026-43886

Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, a logic error in OAuthInterface.validateScope() uses Array.some() to validate requested OAuth scopes, causing the function to accept the entire scope a…

Vulnerability class: Privilege Escalation

EPSS: 0.000 (8.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N.

Affected products

Outline — versions >= 0.84.0, < 1.7.0

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-43886?: CVE-2026-43886 is a high-severity vulnerability in Outline, classified under Improper Privilege Management. CVSS score: 8.2/10. Published 2026-05-11.
How severe is CVE-2026-43886?: High severity. CVSS v3 base score is 8.2 out of 10.