What is CVE-2026-28506?

CVE-2026-28506 is a medium-severity vulnerability in Outline, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-03-17.

How severe is CVE-2026-28506?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Information disclosure in Outline

CVE-2026-28506

Outline is a service that allows for collaborative documentation. Prior to 1.5.0, the events.list API endpoint, used for retrieving activity logs, contains a logic flaw in its filtering mechanism. It allows any authenticated user to retrie…

Vulnerability class: Information Disclosure

EPSS: 0.000 (10.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Outline — versions < 1.5.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

https://github.com/outline/outline/security/advisories/GHSA-69x7-6fcr-mm6g (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-28506?: CVE-2026-28506 is a medium-severity vulnerability in Outline, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-03-17.
How severe is CVE-2026-28506?: Medium severity. CVSS v3 base score is 4.3 out of 10.