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EUVD-2026-260704

fkie_cve-2025-64716

Anubis is a Web AI Firewall Utility that challenges users' connections in order to protect upstream resources from scraper bots. Prior to version 1.23.0, when using subrequest authentication, Anubis did not perform validation of the redirect URL and redirects user to any URL scheme. While most modern browsers do not allow a redirect to `javascript:` URLs, it could still trigger dangerous behavior in some cases. Anybody with a subrequest authentication may be affected. Version 1.23.0 contains a fix for the issue.

GHSA-cf57-c578-7jvv — Anubis vulnerable to possible XSS via redir parameter when using subrequest auth mode

Affected: Go: github.com/TecharoHQ/anubis

### Summary

When using subrequest authentication, Anubis did not perform validation of the redirect URL and redirects user to any URL scheme. While most modern browsers do not allow a redirect to `javascript:` URLs, it could still trigger dangerous behavior in some cases.

`GET https://example.com/.within.website/?redir=javascript:alert()` responds with `Location: javascript:alert()`.

### Impact

Anybody with a subrequest authentication seems affected. Using `javascript:` URLs will probably be blocked by most modern browsers, but using custom protocols for third-party applications might still trigger dangerous operations.

### Note

This was originally reported by @mbiesiad against Weblate.