CVE-2026-32616 Pigeon has a Host Header Injection in email verification flow
Attackers can manipulate the Host header to redirect email verification links, potentially stealing tokens and taking over user accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-32616?
CVE-2026-32616 is a high-severity vulnerability in kasuganosoras Pigeon, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-74
Which versions are affected by CVE-2026-32616?
How do I fix CVE-2026-32616?
No fix has been published for CVE-2026-32616 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-32616 being exploited?
There is no known exploitation of CVE-2026-32616 in the wild and no public exploit code.
Sources
Also known as GHSA-rrj4-9wgq-prcr.