What’s Vulnerable › Vulnerabilities

CVE-2025-59716

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-11-05 · updated 2026-06-17
• Weakness: CWE-200

Description

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.

Affected products

• owncloud Guests: through 0.12.4

References

• https://gist.github.com/thesmartshadow/64ae0449e909174d0479a4f23657147f
• https://github.com/owncloud/guests
• https://marketplace.owncloud.com/apps/guests
• https://yeswehack.com/reports/411806

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