CVE-2026-32616Network attack vector

Account takeover via unvalidated Host header

Published Mar 13, 2026 · Updated Mar 13, 2026

Host header injection in kasuganosoras Pigeon before 1.0.201 allows remote attackers to take over accounts via emailed verification links. Registration and resendmail build verification URLs from the unvalidated HTTP_HOST request value, so a supplied host redirects the link to an attacker-controlled domain. Exploitation requires the recipient to follow the poisoned email link; the exposed token enables takeover of the associated account.

CVSS severity8.2
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Host header injection in kasuganosoras Pigeon before 1.0.201 allows remote attackers to take over accounts via emailed verification links. Registration and resendmail build verification URLs from the unvalidated HTTP_HOST request value, so a supplied host redirects the link to an attacker-controlled domain. Exploitation requires the recipient to follow the poisoned email link; the exposed token enables takeover of the associated account.

The record

CVE
CVE-2026-32616
Published
Mar 13, 2026
Updated
Mar 13, 2026
Vendor
kasuganosoras
Product
Pigeon
Classifications
CWE-74
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.201

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

kasuganosoras · Pigeonversion=< 1.0.201

Published CVSS scores

8.2GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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