CVE-2018-16463

Severity: low (CVSS 3.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-10-30 · updated 2026-06-17
Weakness: CWE-384

Description

A bug causing session fixation in Nextcloud Server prior to 14.0.0, 13.0.3 and 12.0.8 could potentially allow an attacker to obtain access to password protected shares.

Affected products

Nextcloud Server: before 12.0.8; from 13.0.0 before 13.0.3; 14.0.0-beta1, 14.0.0-beta2, 14.0.0-beta3, 14.0.0-beta4, 14.0.0-rc1, 14.0.0-rc2 — fixed in 12.0.8, 13.0.3

How to fix

Upgrade to a fixed version: Nextcloud Server 12.0.8, 13.0.3. Check the vendor advisory for mitigations.

References

https://hackerone.com/reports/237184
https://nextcloud.com/security/advisory/?id=NC-SA-2018-013
https://hackerone.com/reports/237184
https://nextcloud.com/security/advisory/?id=NC-SA-2018-013

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