What’s Vulnerable › Vulnerabilities

CVE-2019-15618

• Severity: medium (CVSS 4.8 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: none known
• Published: 2020-02-04 · updated 2026-06-17
• Weakness: CWE-79

Description

Missing escaping of HTML in the Updater of Nextcloud 15.0.5 allowed a reflected XSS when starting the updater from a malicious location.

Affected products

• Nextcloud Server: before 14.0.9; from 15.0.0 before 15.0.6 — fixed in 14.0.9, 15.0.6

How to fix

Upgrade to a fixed version: Nextcloud Server 14.0.9, 15.0.6. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/515484
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-007
• https://hackerone.com/reports/515484
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-007

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