EUVD-2026-62532Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
Network-reachable unauthenticated endpoint, user interaction required to follow crafted link, scope changes to victim browser session with low integrity impact; no server-side confidentiality or availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
Grav is a file-based Web platform. Prior to 3.8.5, the Login plugin twofa_cancel task accepts a client-controlled _redirect field without a nonce and allows an unauthenticated request to set an external http, https, or protocol-relative Location target. Controller::execute() applies the field when taskTwofa_cancel() sets no redirect, and Grav::getRedirectResponse() accepts the target through Uri::isExternal(), enabling phishing redirects from a trusted Grav host. This issue is fixed in version 3.8.5.
AnalysisAI
Open redirect in the Grav Login plugin (prior to version 3.8.5) allows unauthenticated attackers to weaponize any public Grav installation as a trusted-domain launchpad for phishing. The twofa_cancel task accepted a client-controlled _redirect POST parameter without nonce validation; Controller::execute() forwarded this value through Grav::getRedirectResponse() and Uri::isExternal(), which confirmed the URL was external but did not block it - enabling seamless transparent redirect to attacker-controlled http, https, or protocol-relative targets. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the Grav Login plugin (grav-plugin-login) be installed and active on the target site - it is a standard plugin but must be enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 (AV:N/AC:L/AT:N/PR:N/UI:P) accurately reflects the real-world risk profile: the attack is trivially launched over the network with no authentication and no special conditions, but requires passive user interaction - a victim must click or follow a crafted link. … 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 the Grav Login plugin to version 3.8.5 or later; the patched release is available at https://github.com/getgrav/grav-plugin-login/releases/tag/3.8.5 and the fixing commit is at https://github.com/getgrav/grav-plugin-login/commit/1535e51d2a9cbc3f1bb1e262e791c142a06ce959. … Detailed patch versions, workarounds, and compensating controls in full report. |
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