What’s Vulnerable › Vulnerabilities

CVE-2020-8189

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-08-21 · updated 2026-06-17
• Weakness: CWE-79

Description

A cross-site scripting error in Nextcloud Desktop client 2.6.4 allowed to present any html (including local links) when responding with invalid data on the login attempt.

Affected products

• Desktop Client: before 2.6.5 — fixed in 2.6.5

How to fix

Upgrade to a fixed version: Desktop Client 2.6.5. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/685552
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-027
• https://security.gentoo.org/glsa/202009-09
• https://hackerone.com/reports/685552
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-027
• https://security.gentoo.org/glsa/202009-09

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