CVE-2026-15689 Open redirect in Dancer2::Plugin::Auth::Extensible

What is CVE-2026-15689?

CVE-2026-15689 is a critical vulnerability in ABEVERLEY Dancer2::Plugin::Auth::Extensible, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Dancer2::Plugin::Auth::Extensible versions through 0.713 for Perl allow password reset link poisoning via the request Host header in _default_email_password_reset and _default_welcome_send.

Both default emails emit a link of the form `$base/login/$code`, whose authority comes from the request Host header, or from X-Forwarded-Host under behind_proxy (obtained from Dancer2's request->base function). A POST to /login carrying submit_reset and a username needs no authentication: it stores a fresh reset code against that account and mails the account holder a link to a host of the sender's choosing. The welcome mail takes the same path when the application calls create_user with email_welcome set.

Through 0.711 the handlers read `request->uri_base` and `request->base` directly; Versions 0.712 and later provide an uri_base configuration key that defaults to the untrusted `request->uri_base` when unset.

The default configuration with reset_password_handler enabled and the default message text, a recipient who follows the link hands a working reset code to the sender's host, which is enough to take over the account.

Weakness: CWE-640

Which versions are affected by CVE-2026-15689?

How do I fix CVE-2026-15689?

Apply the vendor's patch.

Is CVE-2026-15689 being exploited?

There is no known exploitation of CVE-2026-15689 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-gmj3-5xfg-q3qg, openSUSE-SU-2026:11564-1.