How broadly exploitable is this vulnerability?

The issue is widely exploitable in the sense that no authentication is needed; any attacker who can share or embed a crafted link can attempt to trick users, but each attack still depends on convincing users to visit and trust the spoofed authorization page.

Does an attacker need direct access to the Discourse server?

No direct server access is required. The attacker needs only network access to the public Discourse instance (as any normal user would have) and a channel to deliver crafted URLs to potential victims.

What is the safest general fix pattern?

The most robust fix is to strictly control which domains and redirect targets can appear in authorization flows using server-side allowlists and authorization checks, eliminating any dependence on untrusted parameters for security-critical UI elements.

Severity:

HIGH RISK

(7.5)

Missing Authorization Checks (CWE-862) Enabling Domain Spoofing in Discourse Authorization Flow

CVE-2026-33427

Published:

Mar 20, 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:

Missing Authorization

CWE:

CWE-862

Impact:

User Impersonation and Phishing Facilitation

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Missing Authorization

CWE:

CWE-862

Impact:

User Impersonation and Phishing Facilitation

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Missing Authorization Checks (CWE-862) Enabling Domain Spoofing in Discourse Authorization Flow

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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