What’s Vulnerable › Vulnerabilities

CVE-2025-64011

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-12 · updated 2026-10-14
• Weakness: CWE-639

Description

Nextcloud Server 30.0.0 is vulnerable to an Insecure Direct Object Reference (IDOR) in the /core/preview endpoint. Any authenticated user can access previews of arbitrary files belonging to other users by manipulating the fileId parameter. This allows unauthorized disclosure of sensitive data, such as text files or images, without prior sharing permissions.

Affected products

• Nextcloud Server: 30.0.0

References

• https://drive.google.com/file/d/1eD3PN-u1caZYgGH96XHmJ7h_OBXEAHW4/view?usp=sharing
• https://gist.github.com/tarekramm/586dfe2d113fedfee6d71182570fc090
• https://nextcloud.com

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