title: OAuth2 client_secret stored in plain text in the Nextcloud database
description: Nextcloud server is an open source home cloud platform. Affected versions of Nextcloud stored OAuth2 tokens in plaintext which allows an attacker who has gained access to the server to potentially elevate their privilege. This issue has been addressed and users are recommended to upgrade their Nextcloud Server to version 25.0.8, 26.0.3 or 27.0.1. There are no known workarounds for this vulnerability.
problem types: CWE-312: Cleartext Storage of Sensitive Information
affected:
{
vendor: nextcloud
product: security-advisories
versions:
version: >= 25.0.0, < 25.0.8, status: affected
version: >= 26.0.0, < 26.0.3, status: affected
version: >= 27.0.0, < 27.0.1, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: HIGH
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
version: 3.1
]