CVE-2018-3761

Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.1 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
nextcloudnextcloud_server
𝑥
< 12.0.8
nextcloudnextcloud_server
13.0.0 ≤
𝑥
< 13.0.3
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://hackerone.com/reports/343111
https://nextcloud.com/security/advisory/?id=nc-sa-2018-003
https://hackerone.com/reports/343111
https://nextcloud.com/security/advisory/?id=nc-sa-2018-003