What’s Vulnerable › Vulnerabilities

CVE-2020-8259

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-16 · updated 2026-06-17
• Weakness: CWE-522

Description

Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the encryption keys.

Affected products

• Nextcloud Server: before 20.0.0 — fixed in 20.0.0

How to fix

Upgrade to a fixed version: Nextcloud Server 20.0.0. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/732431
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-041
• https://hackerone.com/reports/732431
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-041

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