# CVE-2026-72699: Grav Login plugin email address enumeration in registration

Source: https://junglewise.ai/threats/cve-2026-72699-grav-login-plugin-email-address-enumeration-in-registration  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-25. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-72699 · Severity: medium · CVSS 5.3 · Published 2026-08-25

The Grav Login plugin handles user account registration. An attacker can determine which email addresses are registered on a site by repeatedly attempting to register with different email addresses and observing the system responses, since the registration form discloses whether an email is already in use. Without rate limiting on this endpoint, attackers can efficiently enumerate valid email addresses for targeting or social engineering attacks.

Technologies: [Grav Login Plugin](https://junglewise.ai/threats/technologies/login-plugin). Vendors: [Grav](https://junglewise.ai/threats/vendors/grav).

## Quick answers

**Is CVE-2026-72699 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-72699 being exploited in the wild.

**How severe is CVE-2026-72699?** Medium severity, with a CVSS score of 5.3, published 25 August 2026.

**Which products and versions are affected?** Grav Login Plugin before 3.9.1.

**Is there a fix for CVE-2026-72699?** A patch was published on 2026-08-25: Version 3.9.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-72699 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-72699?** Check whether you run Grav Login Plugin at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is an information disclosure vulnerability (CWE-203/CWE-204) in the register() method of classes/Login.php. When a user submits a registration request, the code explicitly throws a distinct RuntimeException (EMAIL_NOT_AVAILABLE) if the email address already belongs to an existing account, but allows registration to proceed silently for new emails. An attacker can exploit this by sending repeated registration requests with different email addresses over the network; each response reveals whether that address is registered. The registration endpoint lacks rate limiting that would be present on login and password-reset endpoints. The patch in version 3.9.1 returns identical generic messages regardless of whether the submitted email is already registered.

## Affected products

- Grav Login plugin before 3.9.1

## Timeline

- 2026-08-25: disclosed
- 2026-08-25: patched: Version 3.9.1 released
- 2026-08-10: advisory: GitHub Security Advisory GHSA-crh8-xm27-j9g9

## References

- [https://github.com/getgrav/grav/security/advisories/GHSA-crh8-xm27-j9g9](https://github.com/getgrav/grav/security/advisories/GHSA-crh8-xm27-j9g9)
- [https://www.vulncheck.com/advisories/grav-login-plugin-before-email-enumeration-via-registration](https://www.vulncheck.com/advisories/grav-login-plugin-before-email-enumeration-via-registration)

## Related threats

- [Grav Login plugin missing authorization in invitation task](https://junglewise.ai/threats/cve-2026-114658-grav-login-plugin-from-3-6-0-before-3-9-13-contains-a-missing)
- [Grav Login plugin privilege escalation in unlock handler](https://junglewise.ai/threats/cve-2026-56710-grav-login-plugin-privilege-escalation-in-unlock-handler)
- [getgrav grav-plugin-login CSRF in regenerate2FASecret task](https://junglewise.ai/threats/cve-2026-62236-getgrav-grav-plugin-login-csrf-in-regenerate2fasecret-task)
- [Grav Login plugin privilege escalation in registration handler](https://junglewise.ai/threats/cve-2026-42613-grav-login-plugin-privilege-escalation-in-registration-handler)