Is this vulnerability remotely exploitable?

Direct remote exploitation is limited because the Incus Web UI listens on localhost only. However, a remote attacker can leverage it indirectly by tricking a local user into interacting with the UI (for example via crafted browser interactions or local malware), effectively turning the user's browser into a conduit.

What level of access does an attacker need to exploit this?

A local attacker needs network access to `127.0.0.1` on the specific random port used by `incus webui` and the ability to send HTTP requests to it. A remote attacker needs some influence over the local user's environment (such as driving the browser or getting the user to follow instructions) to cause interactions with the Incus Web UI.

What is the safest general fix pattern for this kind of issue?

Centralize authentication logic and enforce the same strict token verification on all entry points. Any session establishment—whether via URL parameters, cookies, or headers—should go through a single routine that verifies token authenticity, validity, and binding to the user before setting an authenticated session.

Severity:

HIGH RISK

(8.8)

Improper Authentication Token Validation (CWE-287) in Incus Web UI Local Web Server

CVE-2026-33898

Published:

Mar 26, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Improper Authentication

CWE:

CWE-287

Impact:

Privilege Escalation and Unauthorized Incus Instance Access

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Authentication

CWE:

CWE-287

Impact:

Privilege Escalation and Unauthorized Incus Instance Access

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Improper Authentication Token Validation (CWE-287) in Incus Web UI Local Web Server

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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