What’s Vulnerable › Vulnerabilities

CVE-2024-52520: Nextcloud Server's link reference provider can be tricked into downloading bigger files than intended

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-15 · updated 2026-06-17
• Weakness: CWE-400

Description

Nextcloud Server is a self hosted personal cloud system. Due to a pre-flighted HEAD request, the link reference provider could be tricked into downloading bigger websites than intended, to find open-graph data. It is recommended that the Nextcloud Server is upgraded to 28.0.10 or 29.0.7 and Nextcloud Enterprise Server is upgraded to 27.1.11.8, 28.0.10 or 29.0.7.

Affected products

• Nextcloud Server: from 27.0.0 before 27.1.11.8; from 28.0.0 before 28.0.10; from 29.0.0 before 29.0.7 — fixed in 27.1.11.8, 28.0.10, 29.0.7

How to fix

Upgrade to a fixed version: Nextcloud Server 27.1.11.8, 28.0.10, 29.0.7. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pxqf-cfxw-mqmj
• https://github.com/nextcloud/server/commit/873c42b0f1383d5b6f2b7a481e1d9620ed30f44a
• https://github.com/nextcloud/server/pull/47627

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