What is CVE-2026-33898?

CVE-2026-33898 is a high-severity vulnerability in Linuxcontainers Incus, classified under Improper Authentication. CVSS score: 8.8/10. Published 2026-03-27.

How severe is CVE-2026-33898?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Linuxcontainers Incus

CVE-2026-33898

Incus is a system container and virtual machine manager. Prior to version 6.23.0, the web server spawned by `incus webui` incorrectly validates the authentication token such that an invalid value will be accepted. `incus webui` runs a loca…

Vulnerability class: Broken Authentication

EPSS: 0.003 (27.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Linuxcontainers Incus
Lxc Incus — versions < 6.23.0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33898?: CVE-2026-33898 is a high-severity vulnerability in Linuxcontainers Incus, classified under Improper Authentication. CVSS score: 8.8/10. Published 2026-03-27.
How severe is CVE-2026-33898?: High severity. CVSS v3 base score is 8.8 out of 10.