EUVD-2026-65213
GHSA-55hc-4r2f-h6wr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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
Unauthenticated network enumeration with no user interaction gives AV:N/AC:L/PR:N/UI:N; impact is limited account-existence disclosure so C:L and I:N/A:N.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
The Grav Login plugin (getgrav/grav-plugin-login) before 3.9.1 is vulnerable to email address enumeration. The register() method in classes/Login.php throws a distinct exception (EMAIL_NOT_AVAILABLE) when a submitted email address already belongs to an existing account, while allowing registration to proceed otherwise. Because the registration endpoint has no rate limiting, an attacker can enumerate which email addresses have accounts on the site, one guess per request.
AnalysisAI
Email address enumeration in the Grav Login plugin (getgrav/grav-plugin-login) before 3.9.1 lets unauthenticated remote attackers determine which email addresses are registered on a Grav CMS site. The register() method returns a distinct EMAIL_NOT_AVAILABLE error for already-registered addresses while proceeding normally otherwise, and because the registration endpoint enforces no rate limiting, an attacker can test addresses at scale, one per request. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the Grav site has the Login plugin (before 3.9.1) installed with public self-registration enabled and reachable, which is the specific deployment mode where the register() endpoint is exposed to unauthenticated users. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals here conflict sharply and must be read critically. … 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 | Vendor-released patch: upgrade the Grav Login plugin to version 3.9.1 or later, which is the primary and authoritative fix per advisory GHSA-crh8-xm27-j9g9. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, implement rate limiting on the registration endpoint (maximum 5 requests per IP per minute) and review authentication logs for enumeration patterns (rapid registration failures from single sources). …
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External POC / Exploit Code
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