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CVE-2025-59716

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Date: November 4, 2025

ownCloud Guests before 0.12.5 allows unauthenticated user enumeration via the /apps/guests/register/{email}/{token} endpoint. Because of insufficient validation of the supplied token in showPasswordForm, the server responds differently when an e-mail address corresponds to a valid pending guest user rather than a non-existent user.

Severity Score

Related Resources (6)

https://yeswehack.com/reports/411806
https://marketplace.owncloud.com/apps/guests
https://nvd.nist.gov/vuln/detail/CVE-2025-59716
https://github.com/owncloud/guests
https://gist.github.com/thesmartshadow/64ae0449e909174d0479a4f23657147f
https://www.mend.io/vulnerability-database/CVE-2025-59716

Severity Score

Weakness Type (CWE)

Exposure of Sensitive Information to an Unauthorized Actor

CWE-200

Observable Discrepancy

CWE-203

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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