CVE-2020-8138

6.5 mediumEPSS 1.4%

Medium (6.5) in nextcloud nextcloud server. EPSS 1.4% chance of exploitation in the next 30 days.

A missing check for IPv4 nested inside IPv6 in Nextcloud server < 17.0.1, < 16.0.7, and < 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL.

Severity

CVSS 3.1

6.5 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS: 1.4% chance of exploitation in the next 30 days; higher than 72% of CVEs (scores of 2026-10-31)
CWE: CWE-918
Published: 2020-03-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

nextcloud:nextcloud_server

References

https://hackerone.com/reports/736867
https://nextcloud.com/security/advisory/?id=NC-SA-2020-014
https://hackerone.com/reports/736867
https://nextcloud.com/security/advisory/?id=NC-SA-2020-014

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