What’s Vulnerable › Vulnerabilities

CVE-2020-8223

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-05 · updated 2026-06-17
• Weakness: CWE-269

Description

A logic error in Nextcloud Server 19.0.0 caused a privilege escalation allowing malicious users to reshare with higher permissions than they got assigned themselves.

Affected products

• Fedoraproject Fedora: 32, 33
• Nextcloud Server: 19.0.0

References

• https://hackerone.com/reports/889243
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T7FX3O6SJE2S52I2HAA4DSTUIISP5BNA/
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-029
• https://hackerone.com/reports/889243
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T7FX3O6SJE2S52I2HAA4DSTUIISP5BNA/
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-029

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