Open Redirect in Getgrav Grav
CVE-2026-61451
The Grav API plugin (grav-plugin-api) before 1.0.4 does not validate the origin of the client-supplied admin_base_url field in the POST /api/v1/auth/forgot-password endpoint. The sanitizeHttpUrl() function only checks that the URL scheme is http/https and never verifies the host against the server's own origin, so an attacker can supply an arbitrary host. As a result, an unauthenticated attacker can cause the password reset email sent to a victim to contain a reset link pointing at an attacker-controlled server; when the victim follows the link, the valid reset token is disclosed to the attacker, enabling full account takeover. The vulnerable base URL can also be influenced via the Referer or Origin headers.
Vulnerability class: Open Redirect
EPSS: 0.004 (35.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
Affected products
- Getgrav Grav — versions 0, 1.0.4
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-5xc4-j99p-cp4m) (vendor-advisory)
- VulnCheck Advisory: Grav before 1.0.4 Password Reset Token Poisoning via admin_base_url (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61451?
- CVE-2026-61451 is a critical-severity vulnerability in Getgrav Grav, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.6/10. Published 2026-07-15.
- How severe is CVE-2026-61451?
- Critical severity. CVSS v3 base score is 9.6 out of 10.