Is this vulnerability remotely exploitable?

Yes. An attacker can exploit it remotely by sending crafted HTTP requests with a manipulated Host header and then causing victims to use the resulting verification emails.

Does an attacker need an existing account or authentication to exploit this?

Typically no. The attacker only needs access to the public registration or resend verification endpoints and the ability to control the Host header in their requests.

What is the safest general fix pattern?

Use a fixed, configuration-driven base URL for all verification and password reset links, and remove any dependence on the Host header or other user-controlled headers when constructing these URLs.

Severity:

HIGH RISK

(8.2)

Host Header Injection (CWE-74) in Pigeon Email Verification URLs

CVE-2026-32616

Published:

Mar 16, 2026

Status:

Deferred

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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May 6, 2026

Vulnerability Type

Category:

Host Header Injection

CWE:

CWE-74

Impact:

Account Takeover via Malicious Verification URLs

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Host Header Injection

CWE:

CWE-74

Impact:

Account Takeover via Malicious Verification URLs

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

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Host Header Injection (CWE-74) in Pigeon Email Verification URLs

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

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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