CVE-2025-64716: Anubis vulnerable to possible XSS via redir parameter when using subrequest auth mode

October 30, 2025 (updated November 15, 2025)

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().

References

github.com/TecharoHQ/anubis
github.com/TecharoHQ/anubis/commit/7ed1753fcced351c81961bf520a7bfb2caac6e88
github.com/TecharoHQ/anubis/security/advisories/GHSA-cf57-c578-7jvv
github.com/advisories/GHSA-cf57-c578-7jvv
nvd.nist.gov/vuln/detail/CVE-2025-64716
pkg.go.dev/vuln/GO-2025-4086

Code Behaviors & Features

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