EUVD-2026-52280
GHSA-85vc-29fc-65gw
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AC:H reflects the prerequisite that a form blueprint must use user-controlled Twig interpolation in the redirect target; UI:R because the victim must follow the redirect for phishing impact; I:L captures the URL integrity violation with no direct server confidentiality or availability loss.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
The Grav form plugin (getgrav/grav-plugin-form) before 9.1.13 contains an open redirect vulnerability. Since v9.1.11, the redirect process action evaluates user-supplied form data inside Twig expressions, and Grav::redirect() accepts external URLs without origin validation. When a form blueprint defines a redirect target such as redirect: "{{ form.value('next') }}" using an attacker-controllable field, an unauthenticated form submitter can supply a value like https://evil.com to cause a 302 redirect to an arbitrary external site, enabling phishing.
AnalysisAI
Open redirect in Grav's form plugin (getgrav/grav-plugin-form) versions 9.1.11 through 9.1.12 allows unauthenticated form submitters to cause the server to issue a 302 redirect to an arbitrary external URL, enabling phishing attacks against site visitors. The vulnerability exists because the redirect process action, introduced in v9.1.11, evaluates user-supplied form field values through Twig expressions without sanitizing the resulting URL, and Grav::redirect() passes that output to the browser without origin validation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target site's Grav form blueprint explicitly defines a redirect process action whose target is a Twig expression referencing a user-controllable form field, such as redirect: "{{ form.value('next') }}" or equivalent - this is an author-defined configuration choice, not the default behavior for all Grav forms. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P, score 7.1) indicates a network-exploitable, low-complexity flaw requiring no privileges, with user interaction from the redirected victim. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade grav-plugin-form to version 9.1.13 or later, which is the vendor-confirmed patched release per the advisory at https://github.com/getgrav/grav/security/advisories/GHSA-j2j9-gp72-wqvm. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all Grav installations for versions 9.1.11-9.1.12 and disable or restrict public access to any forms using the redirect process action. …
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