---
sourceDocument: Australia Platform security
sourceDocumentLink: https://www.servicenow.com/docs/r/australia/platform-security

 Release :

    - australia

ft:locale :

    - en-US

ft:publication_title :

    - Australia Platform security

ft:clusterId :

    - psec

bundleId :

    - psec

workflow :

    - Platform


---

# Minimize external user registration link expiration duration

# Minimize external user registration link expiration duration {#ariaid-title1}

Release version: Australia  
Updated March 12, 2026  
![](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.
If the sn_ext_usr_reg.Reg_link_expiration_days system property is not set to the recommended value of <kbd class="ph userinput">3</kbd>, then a registration link could be used by someone other than the intended user if
the link is discovered later in time.

Ensure that the property sn_ext_usr_reg.Reg_link_expiration_days is set to <kbd class="ph userinput">3</kbd> or less.

## 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 | \<none\> |
| Fallback value | 3 |
| Category | [Authentication](https://www.servicenow.com/docs/b9CEYnMpryNiLMZU_fh~Tw "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: Longer expiration windows weaken account provisioning security and create opportunities for unauthorized account creation or impersonation. {#sc-external-user-registration-link-expiration__ul_ihv_dvg_1xb} |
| Dependencies and prerequisites | None |
[ ]

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