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CVE-2026-15689 – Password Reset Link Poisoning / Account Takeover – Dancer2::Plugin::Auth::Extensibl

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Summary

CVE-2026-15689 is a host header injection vulnerability (CWE-640: Weak Password Recovery Mechanism) in Dancer2::Plugin::Auth::Extensible, a Perl authentication plugin for the Dancer2 web framework. Affected versions build password reset and welcome emails using the untrusted request Host header, allowing an unauthenticated attacker to poison the reset link and take over any user account. The issue carries a CRITICAL CVSS v3.1 score of 9.8.

Technical details

  • Root cause: the _default_email_password_reset and _default_welcome_send handlers build the link authority from request->base / request->uri_base, which derive from the client-supplied Host header (or X-Forwarded-Host when behind_proxy is enabled) rather than a trusted, configured application hostname.
  • Trigger condition: an unauthenticated POST to /login with submit_reset and a target username generates a fresh reset code for that account and emails a reset link to a host chosen by the attacker; the same code path is triggered by the welcome email when create_user is called with email_welcome set.
  • Attack vector: network, no authentication or user interaction beyond the victim clicking the received (poisoned) link.
  • Impact: if the victim follows the link, the working reset code is delivered to the attacker-controlled host, enabling full account takeover, including high confidentiality, integrity, and availability impact.

Affected software

  • Dancer2::Plugin::Auth::Extensible versions 0 through 0.713 (through 0.711 the code read request->uri_base/request->base directly with no mitigation; 0.712 introduced a uri_base configuration key that defaults to the untrusted value when left unset).

Severity

  • CVSS v3.1 Base Score: 9.8 (CRITICAL)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: upgrade to Dancer2::Plugin::Auth::Extensible 0.713 or later, and explicitly set the uri_base configuration key to the application’s own trusted base URL.
  • If patching is not immediately possible: reject or normalize any request whose Host (or X-Forwarded-Host) does not match an expected application hostname at the web server or reverse proxy layer before it reaches the application.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • server response header: Perl Dancer (with version)
  • x-powered-by response header: Perl Dancer (with version)

References

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