What is CVE-2026-43888?

CVE-2026-43888 is a high-severity vulnerability in Outline, classified under Path Traversal. CVSS score: 8.7/10. Published 2026-05-11.

How severe is CVE-2026-43888?

High severity. CVSS v3 base score is 8.7 out of 10.

Path Traversal in Outline

CVE-2026-43888

Outline is a service that allows for collaborative documentation. Prior to 1.7.0, ZipHelper.extract computes the extraction path for each entry by passing a full filesystem path through trimFileAndExt, a filename helper that calls path.bas…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.001 (16.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H.

Affected products

Outline — versions < 1.7.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-43888?: CVE-2026-43888 is a high-severity vulnerability in Outline, classified under Path Traversal. CVSS score: 8.7/10. Published 2026-05-11.
How severe is CVE-2026-43888?: High severity. CVSS v3 base score is 8.7 out of 10.