EUVD-2026-16313
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
Lifecycle Timeline
3Description
Tandoor Recipes is an application for managing recipes, planning meals, and building shopping lists. Versions up to and including 2.5.3 set ALLOWED_HOSTS = '*' by default, which causes Django to accept any value in the HTTP Host header without validation. The application uses request.build_absolute_uri() to generate absolute URLs in multiple contexts, including invite link emails, API pagination, and OpenAPI schema generation. An attacker who can send requests to the application with a crafted Host header can manipulate all server-generated absolute URLs. The most critical impact is invite link poisoning: when an admin creates an invite and the application sends the invite email, the link points to the attacker's server instead of the real application. When the victim clicks the link, the invite token is sent to the attacker, who can then use it at the real application. As of time of publication, it is unknown if a patched version is available.
Analysis
Tandoor Recipes versions through 2.5.3 permit Host header injection attacks that enable invite link poisoning, allowing authenticated administrators with high privileges to be social-engineered into sending system-generated invite tokens to attacker-controlled servers. The Django application's default ALLOWED_HOSTS='*' configuration fails to validate HTTP Host headers, which combined with request.build_absolute_uri() usage allows manipulation of all absolute URLs including invite emails, API pagination, and OpenAPI schemas. …
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Remediation
Within 24 hours: Audit ALLOWED_HOSTS configuration in all Tandoor Recipes deployments and restrict to explicit, trusted hostnames (remove wildcard '*' setting); document current administrator activity and any unusual invite link activity. Within 7 days: Review recent invite email logs for any unintended recipient domains; communicate security advisory to all administrative users with training on host header manipulation social engineering. …
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External POC / Exploit Code
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