Server-Side Request Forgery in Nextcloud Server Versions
CVE-2020-8138

6.5MEDIUM

Key Information:

Vendor

Nextcloud
Status
Nextcloud Server
Vendor
CVE Published:
20 March 2020

What is CVE-2020-8138?

A critical vulnerability exists in Nextcloud Server that allows a malicious user to exploit a missing check for IPv4 addresses nested within IPv6. This flaw, present in versions prior to 17.0.1, 16.0.7, and 15.0.14, can be triggered by subscribing to a harmful calendar URL. When exploited, this vulnerability may permit an attacker to send unauthorized requests from the server, potentially leading to data leaks or further system compromises.

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Affected Version(s)

Nextcloud Server Fixed in 17.0.2, 16.0.7, and 15.0.14

References

https://hackerone.com/reports/736867
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https://nextcloud.com/security/advisory/?id=NC-SA-2020-014
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CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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