kasuganosoras Pigeon up to 1.0.200 Message HTTP_HOST injection

Summaryinfo

A vulnerability was found in kasuganosoras Pigeon up to 1.0.200. It has been rated as problematic. This vulnerability affects unknown code of the component Message Handler. Performing a manipulation of the argument HTTP_HOST results in injection. This vulnerability is reported as CVE-2026-32616. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in kasuganosoras Pigeon up to 1.0.200. This affects an unknown function of the component Message Handler. The manipulation of the argument HTTP_HOST with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Pigeon is a message board/notepad/social system/blog. Prior to 1.0.201, the application uses $_SERVER['HTTP_HOST'] without validation to construct email verification URLs in the register and resendmail flows. An attacker can manipulate the Host header in the HTTP request, causing the verification link sent to the user's email to point to an attacker-controlled domain. This can lead to account takeover by stealing the email verification token. This vulnerability is fixed in 1.0.201.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-32616 since 03/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

Upgrading to version 1.0.201 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-12133). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• kasuganosoras

Name

• Pigeon

Version

• 1.0

Website

• Product: https://github.com/kasuganosoras/Pigeon/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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