---
sourceDocument: Zurich Platform security
sourceDocumentLink: https://www.servicenow.com/docs/r/zurich/platform-security

 Release :

    - zurich

ft:locale :

    - en-US

ft:publication_title :

    - Zurich Platform security

ft:clusterId :

    - psec

bundleId :

    - psec

workflow :

    - Platform


---

# Minimize external user registration link expiration duration \[Updated in Security Center 1.3 and 1.5\]

# Minimize external user registration link expiration duration \[Updated in Security Center
1.3 and 1.5\] {#ariaid-title1}

* Release version: Zurich
* 
* Updated July 31, 2025
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read

Manage the number of days that a registration link can be accessed.
Use the sn_ext_usr_reg.Reg_link_expiration_days property to manage who can access a registration link.
If the link is set to the recommended value of 3, a registration link could be used by someone other than the intended user if the link is discovered at a later date.

## More information {#sc-external-user-registration-link-expiration__section_ghv_dvg_1xb}

{#sc-external-user-registration-link-expiration__table_hhv_dvg_1xb__entry__2}

| Attribute | Description |
|-|-|
| Configuration name | sn_ext_usr_reg.Reg_link_expiration_days |
| Configuration type | System Properties (/sys_properties_list.do) |
| Data type | Integer |
| Recommended value | 3 |
| Default value | 3 |
| Category | [Authentication](https://www.servicenow.com/docs/yEXgEAg_NSo5KdsTitNCCA "The authentication category covers the main elements of modern authentication to confirm an entity and its claims are authentic and correct, resistant to impersonation and prevent interception of passwords.") |
| Security risk | * Severity score: Medium * CVSS score: 6.6 * Security risk details: Not setting this property to the integer 3 could lead to the registration link being used by an unintended user. {#sc-external-user-registration-link-expiration__ul_ihv_dvg_1xb} |
| Dependencies and prerequisites | None |
[ ]

{#sc-external-user-registration-link-expiration__table_hhv_dvg_1xb}